The British Bull Dog was a popular type of solid-frame pocket revolver

Revolver

A revolver is a repeating firearm that has a cylinder containing multiple chambers and at least one barrel for firing. The first revolver ever made was built by Elisha Collier in 1818. The percussion cap revolver was invented by Samuel Colt in 1836. This weapon became known as the Colt Paterson...

 introduced by Philip Webley & Son of Birmingham, England in 1872 and subsequently copied by gunmakers in Continental Europe and the United States. It featured a 2.5 inches (63.5 mm) barrel and was chambered for five .44 Short Rimfire, .442 Webley

.442 Webley

The .442 Webley is a British centrefire revolver cartridge....

, or .450 Adams

.450 Adams

The .450 Adams was a British black powder centrefire revolver cartridge, initially used in converted Beaumont-Adams Revolvers, in the late 1860s...

 cartridges. Webley produced smaller scaled .320 Revolver

.320 Revolver

Also known as the .320 European or .320 Bulldog, this revolver cartridge consisted of an 8 mm lead ball , and was designed for the Webley Bulldog in the 1870s....

 and .380 caliber versions later, but did not mark them with the British Bull Dog name.

Designed to be carried in a coat pocket, many have survived to the present day in good condition, having seen little actual use.

Numerous copies of this design were made in Belgium

Belgium

Belgium , officially the Kingdom of Belgium, is a federal state in Western Europe. It is a founding member of the European Union and hosts the EU's headquarters, and those of several other major international organisations such as NATO.Belgium is also a member of, or affiliated to, many...

, Spain

Spain

Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

, France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

, and the USA during the late 19th century.