Jack Russell Terrier
Encyclopedia
The Jack Russell terrier is a small terrier
Terrier
A terrier is a dog of any one of many breeds or landraces of terrier type, which are typically small, wiry, very active and fearless dogs. Terrier breeds vary greatly in size from just a couple of pounds to over 70 pounds and are usually categorized by size or function...

 that has its origins in fox hunting
Fox hunting
Fox hunting is an activity involving the tracking, chase, and sometimes killing of a fox, traditionally a red fox, by trained foxhounds or other scent hounds, and a group of followers led by a master of foxhounds, who follow the hounds on foot or on horseback.Fox hunting originated in its current...

. It is principally white-bodied smooth, rough or broken-coated which is commonly confused with the Parson Russell terrier
Parson Russell Terrier
The Parson Russell Terrier is a breed of small white terrier that originates from the Fox Terriers of the 18th century. The breed is named after the person credited with the creation of this type of dog, the Reverend John "Jack" Russell...

 (the American Kennel Club
American Kennel Club
The American Kennel Club is a registry of purebred dog pedigrees in the United States. Beyond maintaining its pedigree registry, this kennel club also promotes and sanctions events for purebred dogs, including the Westminster Kennel Club Dog Show, an annual event which predates the official...

 (AKC) and affiliate variant) and the Russell terrier
Russell Terrier
The Russell Terrier is a predominantly white working terrier with an insatiable instinct to hunt formidable quarry underground. The breed was derived from the Reverend John Russell's fox working terrier strains that were used in the 19th century for fox hunting. The Reverend's fox working strains...

 (a shorter legged, stockier variety) with the term "Jack Russell" commonly misapplied to other small white terriers. The Jack Russell is a broad type, with a size range of 10–15 in (25.4–38.1 cm), the Parson Russell is limited only to a middle range with a standard size of 12–14 in (30.5–35.6 cm), while the Russell terrier is smaller at 8–12 in (20.3–30.5 cm), however each breed has different physical proportions according to the standards of their breed clubs.

Originating in the early 19th century from dogs bred and used by Reverend John Russell
Jack Russell (dog breeder)
John "Jack" Russell , known as "The Sporting Parson", was an enthusiastic hunter and dog breeder as well as an ordained cleric....

, it has similar origins to the modern Fox terrier
Fox Terrier
Fox Terrier refers primarily to two different breeds of the terrier dog type: the Smooth Fox Terrier and the Wire Fox Terrier. Both of these breeds originated in the 19th century from a handful of dogs who are descended from earlier varieties of British terriers, and are related to other modern...

. The Jack Russell is an energetic breed which relies on a high level of exercise and stimulation, and is relatively free from serious health complaints. It has gone through several changes over the years, through different use and breed standards set by kennel clubs. Recognition for the breed by kennel clubs has been opposed by the breed's parent societies – which resulted in the breeding and recognition of the Parson Russell terrier. Jack Russells have appeared many times in film, television and print with several historical dogs of note.

Sporting parson

The small white-fox working terriers we know today were first bred by the Reverend John Russell
Jack Russell (dog breeder)
John "Jack" Russell , known as "The Sporting Parson", was an enthusiastic hunter and dog breeder as well as an ordained cleric....

, a parson
Parson
In the pre-Reformation church, a parson was the priest of an independent parish church, that is, a parish church not under the control of a larger ecclesiastical or monastic organization...

 and hunting
Hunting
Hunting is the practice of pursuing any living thing, usually wildlife, for food, recreation, or trade. In present-day use, the term refers to lawful hunting, as distinguished from poaching, which is the killing, trapping or capture of the hunted species contrary to applicable law...

 enthusiast born in 1795, and they can trace their origin to the now extinct English White terrier. Difficulty in differentiating the dog from the creature it was pursuing brought about the need for a mostly white dog, and so in 1819 during his last year of university at Exeter College, Oxford
Exeter College, Oxford
Exeter College is one of the constituent colleges of the University of Oxford in England and the fourth oldest college of the University. The main entrance is on the east side of Turl Street...

, he purchased a small white and tan terrier female named Trump from a milkman in the nearby small hamlet
Hamlet
The Tragical History of Hamlet, Prince of Denmark, or more simply Hamlet, is a tragedy by William Shakespeare, believed to have been written between 1599 and 1601...

 of Elsfield
Elsfield
Elsfield is a village and civil parish about northeast of the centre of Oxford.-Parish church:The chancel arch of the Church of England parish church dates from at least the latter part of the 12th century. The church formerly had a north aisle that may also have dated from this period. In about...

. Trump epitomized his ideal Fox terrier
Fox Terrier
Fox Terrier refers primarily to two different breeds of the terrier dog type: the Smooth Fox Terrier and the Wire Fox Terrier. Both of these breeds originated in the 19th century from a handful of dogs who are descended from earlier varieties of British terriers, and are related to other modern...

, which, at the time, was a term used for any terrier which was used to bolt foxes out of their burrows. Her colouring was described as "...white, with just a patch of dark tan over each eye and ear; whilst a similar dot, not larger than a penny piece, marks the root of the tail." Davies, a friend of Russell's, wrote "Trump was such an animal as Russell had only seen in his dreams". She was the basis for a breeding program to develop a terrier with high stamina for the hunt as well as the courage and formation to chase out foxes that had gone to ground. By the 1850s, these dogs were recognised as a distinct breed.

An important attribute in this dog was a tempered aggressiveness that would provide the necessary drive to pursue and bolt the fox without resulting in physical harm to the quarry and effectively ending the chase, which was considered unsporting. Russell was said to have prided himself that his terriers never tasted blood. This line of terriers developed by John Russell was well respected for these qualities and his dogs were often taken on by hunt enthusiasts. It is unlikely, however, that any dogs alive today are descended from Trump, as Russell was forced to sell all his dogs on more than one occasion because of financial difficulty, and had only four aged (and non-breeding) terriers left when he died in 1883.

The Fox terrier and Jack Russell terrier type dogs of today are all descended from dogs of that period, although documented pedigrees earlier than 1862 have not been found. Several records remain of documented breeding by John Russell between the 1860s and 1880s. The Fox Terrier Club was formed in 1875 with Russell as one of the founder members; its breed standard was aspiration and not a description of how the breed appeared then. By the start of the 20th century the Fox terrier had altered more towards the modern breed, but in some parts of the country the old style of John Russell's terriers remained and it is from those dogs that the modern Jack Russell type descends.

Many breeds can claim heritage to the early Fox terrier of this period, including the Brazilian terrier
Brazilian Terrier
The Brazilian Terrier, commonly called Fox Paulistinha, is a breed of dog developed in Brazil. It is one of several terriers probably descended from the combining of the Fox Terrier with other small breeds.- Appearance :...

, Japanese terrier
Japanese Terrier
The is a small terrier native to Japan. It is believed to be descended from the progeny of fox terrier types, pointers and indigenous Japanese dogs. This dog is also known as the Nippon Terrier. The breed is rare, even in Japan.- Appearance :...

, Miniature Fox terrier
Miniature Fox Terrier
The Miniature Fox Terrier is a small, fine, lightweight working terrier developed as a hunting dog and vermin router. It is known colloquially in its native Australia as the “Mini Foxie”.- Appearance :...

, Ratonero Bodeguero Andaluz
Ratonero Bodeguero Andaluz
The Ratonero Bodeguero Andaluz is a Spanish breed of dog of the terrier type. Its name reflects its main occupation: hunting rats and mice hidden between barrels in the wineries of Andalusia in Spain...

, Rat terrier
Rat Terrier
The Rat Terrier is an American dog breed with a rich and varied background as an all-around farm dog and hunting companion. Traditionally more of a type than a breed, they share much ancestry with the tough little mixed-breed dogs known as feists...

 and Tenterfield terrier
Tenterfield Terrier
The Tenterfield Terrier is a small, lightweight terrier developed from the Miniature Fox Terriers, and akin to Rat Terriers. Although it has English origins and was formally called the Mini Foxie, it was developed in Australia...

.

After John Russell

Following Russell's death, the only people who made serious efforts to continue those strains were two men, one in Chislehurst
Chislehurst
Chislehurst is a suburban district in south-east London, England, and an electoral ward of the London Borough of Bromley. It is south-east of Charing Cross.-Toponymy:...

 with the surname of East and another in Cornwall
Cornwall
Cornwall is a unitary authority and ceremonial county of England, within the United Kingdom. It is bordered to the north and west by the Celtic Sea, to the south by the English Channel, and to the east by the county of Devon, over the River Tamar. Cornwall has a population of , and covers an area of...

 named Archer. East, at one point, had several couples, all of which were descended from one of Russell's dogs. The type aimed for were not as big as the show Fox terrier
Fox Terrier
Fox Terrier refers primarily to two different breeds of the terrier dog type: the Smooth Fox Terrier and the Wire Fox Terrier. Both of these breeds originated in the 19th century from a handful of dogs who are descended from earlier varieties of British terriers, and are related to other modern...

 and were usually less than 15 pounds (6.8 kg).

Arthur Blake Heinemann created the first breed standard and, in 1894, he found the Devon and Somerset Badger Club, the aims of which were to promote badger
Badger
Badgers are short-legged omnivores in the weasel family, Mustelidae. There are nine species of badger, in three subfamilies : Melinae , Mellivorinae , and Taxideinae...

 digging rather than fox hunting and the breeding of terriers suitable for this purpose. Terriers were acquired from Nicholas Snow of Oare
Oare
There are at least four villages called Oare in England:*Oare, Berkshire, near Newbury*Oare Marshes, Kent, internationally important nature reserve near Faversham*Oare, Kent, near Faversham*Oare, Somerset, near Minehead*Oare, Wiltshire, near Marlborough...

 and they were likely descended from Russell's original dogs as Russell would probably have hunted at some point with Snow's hunting club and is likely to have provided at least some of their original terriers. By the turn of the 20th century Russell's name had become associated with this breed of dog.

The club would go on to be renamed the Parson Jack Russell Terrier Club. Badger digging required a different type of dog to fox hunting, and it is likely that Bull terrier
Bull Terrier
The Bull Terrier or English Bull Terrier is a breed of dog in the terrier family. They are known for their large, egg-shaped head, small triangular eyes, and "jaunty gait." Their temperament has been described as generally fun-loving, active and clownish...

 stock was introduced to strengthen the breed, which may have caused the creation of a shorter legged variety of Jack Russell terrier that started to appear around this period. At the same time that a split was appearing between show and working Fox terriers, a further split was occurring between two different types of white terrier, both carrying Jack Russell's name. Heinemann was invited to judge classes for working terrier
Working terrier
A working terrier is a small type of dog which pursues its quarry into the earth. According to the Oxford English Dictionary, the name dates back to at least 1440, derived from early modern French terrier - from the medieval Latin terrarius from the Latin terra .With the growth of popularity of...

s at Crufts
Crufts
Crufts is an annual international Championship conformation show for dogs organised and hosted by the Kennel Club, currently held every March at the National Exhibition Centre in Birmingham, England. It is the largest annual dog show in the world, as declared by Guinness World Records, and lasts...

 with an aim to bring working terriers back into the show ring and influence those that disregard working qualities in dogs. These classes were continued for several years by various judges, but Charles Cruft
Charles Cruft
Charles Alfred Cruft was a British showman who founded Crufts dog show.He was educated at Ardingly College, and upon leaving became the general manager of James Spratt, dog biscuit manufacturer...

 dropped the attempt as the classes were never heavily competed. Following Heinemann's death in 1930, the kennel and leadership of the club passed to Annie Harris, but the club itself folded shortly before World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

.

Post World War II

Following World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

, the requirement for hunting dogs drastically declined, and with it the numbers of Jack Russell terriers. The dogs were increasingly used as family and companion dogs. Further cross breeding occurred, with Welsh corgis
Welsh Corgi
The Welsh corgi is a small type of herding dog that originated in Wales. Two distinct breeds are recognized: the Pembroke Welsh corgi and the Cardigan Welsh corgi, with the Pembroke being the more common..-Description:...

, Chihuahuas
Chihuahua (dog)
The ' is the smallest breed of dog and is so named for the state of Chihuahua in Mexico. Chihuahuas come in a wide variety of sizes, head shapes, colors and coat lengths.-History:...

 and other smaller breeds of terrier. The offspring of these crosses became known as Puddin' Dogs, Shortie Jacks or Russell Terrier
Russell Terrier
The Russell Terrier is a predominantly white working terrier with an insatiable instinct to hunt formidable quarry underground. The breed was derived from the Reverend John Russell's fox working terrier strains that were used in the 19th century for fox hunting. The Reverend's fox working strains...

s.

The Jack Russell Terrier Club of America
Jack Russell Terrier Club of America
The Jack Russell Terrier Club of America is the largest Jack Russell Terrier club and registry in the world, and is the National Breed Club and Registry for the Jack Russell Terrier in the United States....

 was formed in 1976 by Ailsa Crawford, one of the first Jack Russell terrier breeders in the United States. Size ranges for dogs were kept broad, with the ability of working dogs awarded higher than those in conformation show
Conformation show
Conformation shows, also referred to as breed shows, are a kind of dog show in which a judge familiar with a specific dog breed evaluates individual purebred dogs for how well the dogs conform to the established breed type for their breed, as described in a breed's individual breed standard.A...

s. An open registry was maintained with restricted line breeding. Registration for the club is made at adulthood for Jack Russells rather than at birth, to ensure the breed's qualities remain given the open registry.
Several breed clubs appeared in the United Kingdom during the 70s to promote the breed, including the Jack Russell Club of Great Britain (JRTCGB) and the South East Jack Russell Terrier Club (SEJRTC). The JRTCGB promoted the range of sizes that remain in its standards today, whereas the SEJRTC set a minimum height for dogs at 13 inches (33 cm). While the JRTCGB sought to ensure that the breed's working ability remained through non-recognition with breed registries, the SEJRTC activity sought recognition with the UK Kennel Club
Kennel club
A kennel club is an organization for canine affairs that concerns itself with the breeding, showing and promotion of more than one breed of dog...

. In 1983 the Parson Jack Russell Club of Great Britain (PJRTCGB) was resurrected to seek Kennel Club recognition for the breed. Although the application was initially rejected, a new standard was created for the PJRTCGB based on the standard of the SEJRTC, and under that standard the breed was recognised by the Kennel Club in 1990 as the Parson Jack Russell terrier. Jack was dropped from the official name in 1999, and the recognised name of the breed became the Parson Russell terrier
Parson Russell Terrier
The Parson Russell Terrier is a breed of small white terrier that originates from the Fox Terriers of the 18th century. The breed is named after the person credited with the creation of this type of dog, the Reverend John "Jack" Russell...

.

In the late 1990s, the American Kennel Club
American Kennel Club
The American Kennel Club is a registry of purebred dog pedigrees in the United States. Beyond maintaining its pedigree registry, this kennel club also promotes and sanctions events for purebred dogs, including the Westminster Kennel Club Dog Show, an annual event which predates the official...

 explored the possibility of recognising the Jack Russell terrier. This move was opposed by the Jack Russell terrier Club of America as they did not want the breed to lose its essential working characteristics. The Jack Russell Terrier Breeders Association was formed, and petitioned the AKC with the breed's admission granted in 2001. Under the AKC recognised standard, the size of the breed was narrowed from the previous club's standard and the name of the AKC recognised Jack Russell terrier was changed to Parson Russell terrier, with the Jack Russell Terrier Breeders Association renamed to the Parson Russell Terrier Association of America.

The Australian National Kennel Council
Australian National Kennel Council
The Australian National Kennel Council is the peak body in Australia responsible for promoting breeding, showing, trialling, obedience, and other canine-related activities and the ownership of temperamentally and physically sound purebred dogs by individuals across Australia. It was formed in...

 (ANKC) and the New Zealand Kennel Club
New Zealand Kennel Club
The New Zealand Kennel Club is the primary kennel club responsible for dog pedigree registration services in New Zealand. They also provide training services, judging for dog shows and many other services relating to dog showing. The organisation was introduced in 1886, it is also a full member of...

 (NZCK) are the some of national kennel associations which registers both the Jack Russell terrier and the Parson Russell terrier, however the size requirements for the Jack Russell terrier under both those standards would classify a dog as a Russell terrier in the United States. In 2009, there were 1073 Jack Russells registered with the ANKC, compared to 18 for the Parson Russell terrier. Other modern breeds are often mistaken for modern Jack Russell terriers, including their cousin the Parson Russell terrier, the Tenterfield terrier, and the Rat Terrier
Rat Terrier
The Rat Terrier is an American dog breed with a rich and varied background as an all-around farm dog and hunting companion. Traditionally more of a type than a breed, they share much ancestry with the tough little mixed-breed dogs known as feists...

. Several other modern breeds exist that descended from the early Fox Terrier breed, including the Brazilian Terrier
Brazilian Terrier
The Brazilian Terrier, commonly called Fox Paulistinha, is a breed of dog developed in Brazil. It is one of several terriers probably descended from the combining of the Fox Terrier with other small breeds.- Appearance :...

, Japanese Terrier
Japanese Terrier
The is a small terrier native to Japan. It is believed to be descended from the progeny of fox terrier types, pointers and indigenous Japanese dogs. This dog is also known as the Nippon Terrier. The breed is rare, even in Japan.- Appearance :...

, Miniature Fox Terrier
Miniature Fox Terrier
The Miniature Fox Terrier is a small, fine, lightweight working terrier developed as a hunting dog and vermin router. It is known colloquially in its native Australia as the “Mini Foxie”.- Appearance :...

, Ratonero Bodeguero Andaluz
Ratonero Bodeguero Andaluz
The Ratonero Bodeguero Andaluz is a Spanish breed of dog of the terrier type. Its name reflects its main occupation: hunting rats and mice hidden between barrels in the wineries of Andalusia in Spain...

, Rat Terrier and Tenterfield Terrier.

Description

Due to their working nature, Jack Russell terriers remain much as they were some 200 years ago. They are sturdy, tough, and tenacious, measuring between 10–15 in (25.4–38.1 cm) at the withers
Withers
The withers is the ridge between the shoulder blades of a four-legged animal. In many species it is the tallest point of the body, and in horses and dogs it is the standard place to measure the animal's height .-Horses:The withers in horses are formed by the dorsal spinal processes of roughly the...

, and weigh 14–18 lb (6.4–8.2 kg). The body length must be in proportion to the height, and the dog should present a compact, balanced image. Predominantly white in coloration (more than 51%) with black and/or tan markings, they exhibit either a smooth, rough or a combination of both which is known as a broken coat. A broken-coated dog may have longer hair on the tail or face than that which is seen on a smooth-coated dog. The skin can sometimes show a pattern of small black or brown spots, referred to as "ticking" that do not carry through to the outer coat. All coat types should be dense double coats that are neither silky (in the case of smooth coats) nor woolly (in the case of rough coats).

The head should be of moderate width at the ears, narrowing to the eyes, and slightly flat between the ears. There should be a defined but not overpronounced stop at the end of the muzzle where it meets the head, and a black nose. The jaw should be powerful and well boned with a scissor bite and straight teeth. The eyes are almond shaped and dark colored, and should be full of life and intelligence. Small V-shaped ears of moderate thickness are carried forward on the head. When the dog is alert, the tip of the V should not extend past the outer corner of the eyes. The tail is set high and in the past was docked to approximately five inches in order to provide a sufficient hand-hold for gripping the terrier.

The Jack Russell should always appear balanced and alert. As it is primarily a working terrier, its most important physical characteristic is its chest size, which must not be so large that it prevents the dog from entering and working in burrows. The red fox
Red Fox
The red fox is the largest of the true foxes, as well as being the most geographically spread member of the Carnivora, being distributed across the entire northern hemisphere from the Arctic Circle to North Africa, Central America, and the steppes of Asia...

 is the traditional quarry
Quarry
A quarry is a type of open-pit mine from which rock or minerals are extracted. Quarries are generally used for extracting building materials, such as dimension stone, construction aggregate, riprap, sand, and gravel. They are often collocated with concrete and asphalt plants due to the requirement...

 of the Jack Russell terrier, so the working Jack Russell must be small enough to pursue it. Red foxes vary in size, but across the world they average from 13 lbs in weight and have an average chest size of 12–14 in (30.5–35.6 cm) at the widest part.

Differences with related breeds

The Jack Russell Terrier and Parson Russell terrier breeds are similar as they share a common origin, but with several marked differences—the most notable being the range of acceptable heights. Other differences in the Parson can include a longer head and larger chest as well as overall a larger body size. The height of a Parson Russell at the withers
Withers
The withers is the ridge between the shoulder blades of a four-legged animal. In many species it is the tallest point of the body, and in horses and dogs it is the standard place to measure the animal's height .-Horses:The withers in horses are formed by the dorsal spinal processes of roughly the...

 according to the breed standard is 12–14 in (30.5–35.6 cm) which places it within the range of the Jack Russell Terrier Club of America
Jack Russell Terrier Club of America
The Jack Russell Terrier Club of America is the largest Jack Russell Terrier club and registry in the world, and is the National Breed Club and Registry for the Jack Russell Terrier in the United States....

's standard size for a Jack Russell of 10–15 in (25.4–38.1 cm). However the Parson Russell is a conformation show
Conformation show
Conformation shows, also referred to as breed shows, are a kind of dog show in which a judge familiar with a specific dog breed evaluates individual purebred dogs for how well the dogs conform to the established breed type for their breed, as described in a breed's individual breed standard.A...

 standard whereas the Jack Russell standard is a more general working standard.

The Russell terrier, which is also sometimes called the English Jack Russell terrier or the Short Jack Russell terrier is a generally smaller related breed. Both the breed standards of the American Russell Terrier Club and the English Jack Russell Terrier Club Alliance states that at the withers it should be an ideal height of 8–12 in (20.3–30.5 cm). Although sometimes called the English or Irish Jack Russell terrier, this is not the recognised height of Jack Russells in the United Kingdom
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

. According to the Jack Russell Club of Great Britain's breed standard, it is the same size as the standard for Jack Russells in the USA, 10–15 in (25.4–38.1 cm). Compared to the Parson, the Russell terrier should always be longer than tall at the withers, whereas the Parson's points should be of equal distance. The Fédération Cynologique Internationale
Fédération Cynologique Internationale
Fédération Cynologique Internationale is an international federation of kennel clubs based in Thuin, Belgium. The English language translation, World Canine Organisation, is not often used.Its goals are described in Article 2 of their regulations:...

 standard for the Jack Russell terrier has this smaller size listed as a requirement. Terrierman Eddie Chapman, who has hunted in Devon for more than 30 years, the same area that John Russell himself hunted, notes that, "I can state categorically that if given the choice, ninety-nine percent of hunt terrier men would buy an under 12" worker, if it was available, over a 14" one."

Temperament

Jack Russells are first and foremost a working terrier
Working terrier
A working terrier is a small type of dog which pursues its quarry into the earth. According to the Oxford English Dictionary, the name dates back to at least 1440, derived from early modern French terrier - from the medieval Latin terrarius from the Latin terra .With the growth of popularity of...

. Originally bred to bolt fox from their dens during hunts, they are used on numerous ground-dwelling quarry such as groundhog, badger, and red and grey fox. The working JRT is required to locate quarry in the earth, and then either bolt it or hold it in place until they are dug to. To accomplish this, the dog won't bark but will expect attention to the quarry continuously. Because the preservation of this working ability is of highest importance to most registered JRTCA/JRTCGB breeders, Jack Russells tend to be extremely intelligent, athletic, fearless, and vocal dogs. It is not uncommon for these dogs to become moody or destructive if not properly stimulated and exercised, as they have a tendency to bore easily and will often create their own fun when left alone to entertain themselves.

Their high energy and drive make these dogs ideally suited to a number of different dog sports such as flyball
Flyball
Flyball is a dog sport in which teams of dogs race against each other from a start/finish line, over a line of hurdles, to a box that releases a tennis ball to be caught when the dog presses the spring-loaded pad, then back to their handlers while carrying the ball.Flyball is run in teams of four...

 or agility
Dog agility
Dog agility is a dog sport in which a handler directs a dog through an obstacle course in a race for both time and accuracy. Dogs run off-leash with no food or toys as incentives, and the handler can touch neither dog nor obstacles...

. Obedience classes are also recommended to potential owners, as Jack Russells can be stubborn at times and aggressive towards other animals and humans if not properly socialized. Despite their small size, these dogs are not recommended for the condominium or apartment dweller unless the owner is ready to take on the daunting task of providing the dog with the necessary amount of exercise and stimulation. They have a tremendous amount of energy for their size, a fact which can sometimes lead to trouble involving larger animals. They may seem never to tire and will still be energetic after their owner has called it a day. While socialized members of the breed are friendly towards children, they will not tolerate abuse even if it is unintentional.

Health

The breed has a reputation for being healthy with a long lifespan. Breeders have protected the gene pool, and direct in-line breeding has been prevented. Jack Russells can live anywhere from between 13 to 16 years on average given proper care. However certain lines have been noted for having specific health concerns, and therefore could occur in any line or generation because of recessive genes. These issues can include hereditary cataract
Cataract
A cataract is a clouding that develops in the crystalline lens of the eye or in its envelope, varying in degree from slight to complete opacity and obstructing the passage of light...

s, ectopia lentis
Ectopia lentis
Ectopia lentis is a displacement or malposition of the eye's crystalline lens from its normal location. A partial dislocation of a lens is termed lens subluxation or subluxated lens; a complete dislocation of a lens is termed lens luxation or luxated lens.-Ectopia lentis in dogs and cats:Although...

, congenital deafness, patellar luxation, ataxia
Ataxia
Ataxia is a neurological sign and symptom that consists of gross lack of coordination of muscle movements. Ataxia is a non-specific clinical manifestation implying dysfunction of the parts of the nervous system that coordinate movement, such as the cerebellum...

, myasthenia gravis
Myasthenia gravis
Myasthenia gravis is an autoimmune neuromuscular disease leading to fluctuating muscle weakness and fatiguability...

, Legg–Calvé–Perthes syndrome and von Willebrand disease
Von Willebrand disease
von Willebrand disease is the most common hereditary coagulation abnormality described in humans, although it can also be acquired as a result of other medical conditions. It arises from a qualitative or quantitative deficiency of von Willebrand factor , a multimeric protein that is required for...

.

Being a hunt-driven dog, the Jack Russell will usually pursue most creatures that it encounters. This includes the skunk
Skunk
Skunks are mammals best known for their ability to secrete a liquid with a strong, foul odor. General appearance varies from species to species, from black-and-white to brown or cream colored. Skunks belong to the family Mephitidae and to the order Carnivora...

, and the breed is prone to skunk toxic shock syndrome. The chemical in the skunk spray is absorbed by the dog and causes the red blood cell
Red blood cell
Red blood cells are the most common type of blood cell and the vertebrate organism's principal means of delivering oxygen to the body tissues via the blood flow through the circulatory system...

s to explode, which can occasionally lead to fatal anemia
Anemia
Anemia is a decrease in number of red blood cells or less than the normal quantity of hemoglobin in the blood. However, it can include decreased oxygen-binding ability of each hemoglobin molecule due to deformity or lack in numerical development as in some other types of hemoglobin...

 and kidney
Kidney
The kidneys, organs with several functions, serve essential regulatory roles in most animals, including vertebrates and some invertebrates. They are essential in the urinary system and also serve homeostatic functions such as the regulation of electrolytes, maintenance of acid–base balance, and...

 failure. If sprayed underground, it can also cause chemical burning of the cornea. Treatments are available to flush the toxin out of the dog's system.

Eye disorders

Lens luxation, also known as ectopia lentis is the most common hereditary disorder in Jack Russell terriers. Even so, this condition is not a common occurrence in the breed. Most frequently appearing in dogs between the ages of 3 and 8 years old, it is where the lens in one or both eyes becomes displaced. There are two types, posterior luxation (where the lens slips to the back of the eye) and anterior luxation (where the lens slips forward). Posterior luxation is the less severe of the two types, as the eye can appear normal although the dog's eyesight will be affected. In anterior luxation, the lens can slip forward and rub against the cornea
Cornea
The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. Together with the lens, the cornea refracts light, with the cornea accounting for approximately two-thirds of the eye's total optical power. In humans, the refractive power of the cornea is...

, damaging it. Anterior luxation also has a high probability of causing glaucoma
Glaucoma
Glaucoma is an eye disorder in which the optic nerve suffers damage, permanently damaging vision in the affected eye and progressing to complete blindness if untreated. It is often, but not always, associated with increased pressure of the fluid in the eye...

 which can lead to partial or complete blindness. Treatment is available and may include both medical and surgical options. Secondary lens luxation is caused by trauma to the eye, and is not hereditary. The condition appears in a number of terrier breeds as well as the Border collie
Border Collie
The Border Collie is a herding dog breed developed in the Anglo-Scottish border region for herding livestock, especially sheep. It is the most widespread of the collie breeds....

, Brittany
Brittany (dog)
The Brittany is a breed of gun dog bred primarily for bird hunting. Although the Brittany is often referred to as a Spaniel, the breed's working characteristics are more akin to those of a pointer or setter.-History:...

 and Cardigan Welsh corgi
Cardigan Welsh Corgi
The Cardigan Welsh corgi is one of two separate dog breeds known as Welsh corgis that originated in Wales, the other being the Pembroke Welsh corgi. It is one of the oldest herding breeds.-Characteristics:...

.

Cataracts can affect any breed of dog, and is the same condition as seen in humans. Here the lens of the eye hardens and is characterized by cloudiness in the eye. Cataracts will blur the dog's vision and can lead to permanent blindness if left untreated. While considered mainly a hereditary disease, it can also be caused by diabetes
Diabetes in dogs
Diabetes mellitus is a disease in which the beta cells of the endocrine pancreas either stop producing insulin or can no longer produce it in enough quantity for the body's needs. The condition is commonly divided into two types, depending on the origin of the condition: Type 1 diabetes, sometimes...

, old age, radiation, eye injury or exposure to high temperatures.

Musculoskeletal conditions

Patellar luxation, also known as luxating patella, is a hereditary disorder affecting the knees. It is where the kneecap slips off the groove on which it normally sits. The effects can be temporary with the dog running while holding its hind leg in the air before running on it again once the kneecap slipped back into place as if nothing has happened. Dogs can have a problem with both rear knees, and complications can include arthritis
Arthritis
Arthritis is a form of joint disorder that involves inflammation of one or more joints....

 or torn knee ligaments. Severe cases can require surgery.

Legg–Calvé–Perthes syndrome, also called Avascular Necrosis of the Femoral Head, is where the ball section of the femur
Femur
The femur , or thigh bone, is the most proximal bone of the leg in tetrapod vertebrates capable of walking or jumping, such as most land mammals, birds, many reptiles such as lizards, and amphibians such as frogs. In vertebrates with four legs such as dogs and horses, the femur is found only in...

 in the hip joint deteriorates following interruption of the blood flow and is the same condition as in human
Human
Humans are the only living species in the Homo genus...

s. In dogs, this causes lameness of the hind-legs, the thigh muscles to atrophy and pain in the joint. It usually occurs between 6–12 months of age and has been documented in a variety of other terrier breeds including the Border terrier
Border Terrier
The Border Terrier is a small, rough-coated breed of dog of the terrier group. Originally bred as fox and vermin hunters, Border Terriers share ancestry with Dandie Dinmont Terriers and Bedlington Terriers....

, Lakeland terrier
Lakeland Terrier
The Lakeland Terrier is a dog breed, which takes its name from its home of origin, the Lake District in England. The dog is a small to mid-size member of the Terrier family. While independent in personality, it interacts well with owners and all family members, and is mostly hypo-allergenic...

 and Wheaten terrier.

Well-known Jack Russell terriers

Nipper
Nipper
Nipper was a dog that served as the model for a painting titled His Late Master's Voice. This image was the basis for the dog and trumpet logo used by several audio recording and associated brands: His Master's Voice, HMV, RCA, Victor Talking Machine Company, RCA Victor and JVC.- Biography :Nipper...

 was a dog born in 1884 who was thought to be a dog of the Jack Russell terrier type. He was the inspiration for the painting Dog looking at and listening to a Phonograph, later renamed to His Master's Voice. The painting was used by a variety of music related companies including The Gramophone Company and EMI
EMI
The EMI Group, also known as EMI Music or simply EMI, is a multinational music company headquartered in London, United Kingdom. It is the fourth-largest business group and family of record labels in the recording industry and one of the "big four" record companies. EMI Group also has a major...

. Today it remains in use incorporated into the logo for HMV
HMV
His Master's Voice is a trademark in the music business, and for many years was the name of a large record label. The name was coined in 1899 as the title of a painting of the dog Nipper listening to a wind-up gramophone...

 in UK and Europe.

A Jack Russell named Bothy made history in 1982 as part of the Transglobe Expedition
Transglobe Expedition
In 1979, adventurers Sir Ranulph Fiennes and Charles R. Burton set out to make the first circumpolar navigation, traveling the world "vertically" traversing both of the poles. Starting from Greenwich in the United Kingdom, they went south, arriving at the South Pole on December 17, 1980. Over the...

. Owned by explorers Ranulph
Ranulph Fiennes
Sir Ranulph Twisleton-Wykeham-Fiennes, 3rd Baronet, OBE , better known as Ranulph Fiennes, is a British adventurer and holder of several endurance records. He is also a prolific writer. Fiennes served in the British Army for eight years including a period on counter-insurgency service while...

 and Ginny Fiennes
Ginny Fiennes
Virginia Frances "Ginny" Fiennes was a noted explorer and wife of adventurer Ranulph Fiennes...

, he became the first dog to travel to both the north
North Pole
The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is, subject to the caveats explained below, defined as the point in the northern hemisphere where the Earth's axis of rotation meets its surface...

 and south pole
South Pole
The South Pole, also known as the Geographic South Pole or Terrestrial South Pole, is one of the two points where the Earth's axis of rotation intersects its surface. It is the southernmost point on the surface of the Earth and lies on the opposite side of the Earth from the North Pole...

s. This feat is unlikely to be repeated, as all dogs have been banned from Antarctica by the Antarctic Treaty nations since 1994, due to fears that they could transmit diseases to the native seal
Pinniped
Pinnipeds or fin-footed mammals are a widely distributed and diverse group of semiaquatic marine mammals comprising the families Odobenidae , Otariidae , and Phocidae .-Overview: Pinnipeds are typically sleek-bodied and barrel-shaped...

 population. Ranulph Fiennes and Charles Burton
Charles R. Burton
Charles Robert Burton was a British explorer. He took part in the Transglobe Expedition, the first expedition to circumnavigate the globe from pole to pole.Burton was born in Cape Town, South Africa...

 actually made the trip to the north pole by powered sledges before signalling to the base camp that they had arrived. To celebrate their achievement, a plane was sent out to take the two men champagne, along with Bothy.

On April 29, 2007, a Jack Russell named George
George (dog)
George, , was a Jack Russell Terrier from New Zealand who was posthumously awarded a PDSA Gold Medal in February 2009. He defended children from an attack by two Pit Bulls but subsequently died of his injuries.-Biography:...

 saved five children at a carnival in New Zealand from an attack by two pit bull
Pit bull
A Pit bull is any of several breeds of dog in the molosser breed group.Many jurisdictions that restrict pit bulls, including Ontario, Canada,, Miami, Florida, U.S...

s. He was reported to have charged at them and held them at bay long enough for the children to get away. Killed by the pit bulls, he was posthumously awarded the PDSA Gold Medal
PDSA Gold Medal
The PDSA Gold Medal is an animal bravery award that acknowledges the bravery and devotion to duty of animals. It was created by the People's Dispensary for Sick Animals in 2001, and is now recognised as the animal equivalent of the George Cross...

 in 2009, the animal equivalent of the George Cross
George Cross
The George Cross is the highest civil decoration of the United Kingdom, and also holds, or has held, that status in many of the other countries of the Commonwealth of Nations...

. A statue has been erected in Manaia, New Zealand
New Zealand
New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

 in his memory. A former US Marine also donated to George's owner a Purple Heart
Purple Heart
The Purple Heart is a United States military decoration awarded in the name of the President to those who have been wounded or killed while serving on or after April 5, 1917 with the U.S. military. The National Purple Heart Hall of Honor is located in New Windsor, New York...

 award he had received for service in Vietnam
Vietnam War
The Vietnam War was a Cold War-era military conflict that occurred in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. This war followed the First Indochina War and was fought between North Vietnam, supported by its communist allies, and the government of...

.

On screen and in literature

In the UK, one of the more recognisable canine stars was restaurateur and chef Rick Stein
Rick Stein
Christopher Richard "Rick" Stein OBE is an English chef, restaurateur and television presenter. He is currently the head chef and co-owner of "Rick Stein at Bannisters" at Mollymook, New South Wales, Australia, owns four restaurants in Padstow, a fish and chip shop in Falmouth, Cornwall and has...

's irrepressible terrier Chalky
Chalky
Chalky was TV chef Rick Stein's rough-haired Jack Russell Terrier dog, who regularly accompanied Stein when filming his popular cookery shows and became recognised and popular in his own right - many of Stein's friends and interviewees claimed he was more famous than the chef himself.The fearless,...

, who frequently upstaged his owner on his various cookery series. He was unique in having his own line of merchandise, including plushes, tea towels, art prints, art paw prints and two real ales - Chalky's Bite and Chalky's Bark, which won gold in the Quality Drink Awards 2009. Chalky was given a BBC
BBC
The British Broadcasting Corporation is a British public service broadcaster. Its headquarters is at Broadcasting House in the City of Westminster, London. It is the largest broadcaster in the world, with about 23,000 staff...

 obituary when he died in 2007.

Father Moose
Moose (dog actor)
Moose was a veteran canine actor. He was a Jack Russell Terrier and is most famous for his portrayal of Eddie Crane on the television sitcom Frasier.-Early life:...

 and son Enzo played the role of Eddie on the long-running TV sitcom Frasier
Frasier
Frasier is an American sitcom that was broadcast on NBC for eleven seasons, from September 16, 1993, to May 13, 2004. The program was created and produced by David Angell, Peter Casey, and David Lee in association with Grammnet and Paramount Network Television.A spin-off of Cheers, Frasier stars...

. Eddie belonged to lead character Frasier's father Martin, and constantly "stole the show" with his deadpan antics, receiving more fan mail than any other Frasier character. Moose and Enzo also starred as Skip in the 2000 film My Dog Skip
My Dog Skip (film)
My Dog Skip is a 2000 film, directed by Jay Russell. It is based on the autobiographical book My Dog Skip by Willie Morris. The movie was released January 14, 2000....

.

Wishbone
Wishbone (TV series)
Wishbone is a television show which aired from 1995 to 1998 and reruns from 1998 to 2001 in the United States featuring a Jack Russell Terrier of the same name. The main character, the talking dog Wishbone, lives with his owner Joe Talbot in the fictional modern town of Oakdale, Texas...

, from the television show of the same name which aired from 1995 to 2001 in the United States, was a Jack Russell terrier. Wishbone's real name was Willowall Soccer
Soccer (dog actor)
Soccer was a Jack Russell terrier dog actor. A veteran of many television commercials for companies like Nike Athletics and Mighty Dog Dog Food, he became famous portraying the talking dog Wishbone in the PBS TV series of the same name...

, and was chosen from over a hundred other dogs vying for the part.

Actor Gene Hackman's pet in the 1995 movie Crimson Tide
Crimson Tide (film)
The film has uncredited additional writing by Quentin Tarantino, much of it being the pop-culture reference-laden dialogue.The U.S. Navy objected to many of the elements in the script — particularly the aspect of mutiny on board a U.S. naval vessel — and as such, the film was produced...

was a smooth-coated Jack Russell terrier named "Bear". Max, a Jack Russell terrier, played the role of Milo who is one of Stanley Ipkiss's only friends in the 1994 U.S film The Mask
The Mask (film)
The Mask is a 1994 American superhero comedy film based on a series of comic books published by Dark Horse Comics. This film was directed by Chuck Russell, and produced by Dark Horse Entertainment and New Line Cinema, and originally released to movie theatres on July 29, 1994 through New Line...

starring Jim Carrey
Jim Carrey
James Eugene "Jim" Carrey is a Canadian-American actor and comedian. He has received two Golden Globe Awards and has also been nominated on four occasions. Carrey began comedy in 1979, performing at Yuk Yuk's in Toronto, Ontario...

. Max also played the female dog Audrey in the 2000 film Mr. Accident
Mr. Accident
Mr. Accident is a comedy written, directed, produced by, and starring the Australian actor Yahoo Serious. It was released in the USA by United Artists...

. In the 2009 movie Hotel for Dogs
Hotel for Dogs (film)
Hotel for Dogs is a 2009 American children's comedy film based on the 1971 Lois Duncan novel of the same name. The film, directed by Thor Freudenthal and adapted by Jeff Lowell, Bob Schooley, and Mark McCorkle, stars Johnny Simmons, Emma Roberts, Jake T. Austin, Lisa Kudrow, Kevin Dillon, Kyla...

, Friday, one of the main characters is a Jack Russell, played by the dog actor Cosmo
Cosmo (dog)
Cosmo is a canine actor. He is a Jack Russell Terrier that is best known for his roles in the movies Hotel for Dogs and Beginners. He was adopted from a breed rescue society by animal trainer Mathilda DeCagny.-Early life and career:...

. Cosmo went on to appear in the films Paul Blart: Mall Cop and Beginners
Beginners
Beginners is a 2010 American comedy-drama film written and directed by Mike Mills. It tells the story of Oliver , a man reflecting on the life and death of his father while trying to forge a new romantic relationship with a woman dealing with father issues of her own.Beginners premiered at the 2010...

.
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