The Welsh corgi is a small type

Dog type

Dog types are broad categories of dogs based on function, with dogs identified primarily by specific function or style of work rather than by lineage or appearance....

 of herding dog

Herding dog

A herding dog, also known as a stock dog or working dog, is a type of pastoral dog that either has been trained in herding or belongs to breeds developed for herding...

 that originated in Wales

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

. Two distinct breeds are recognized: the Pembroke Welsh corgi

Pembroke Welsh Corgi

The Pembroke Welsh Corgi is a herding dog breed, which originated in Pembrokeshire, Wales. It is one of two breeds known as Welsh Corgi: the other is the Cardigan Welsh Corgi. The corgi is one of the smallest dogs in the Herding Group. Pembroke Welsh Corgis are famed for being the preferred breed...

 and the 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:...

, with the Pembroke being the more common..
There are two breeds of Welsh corgis, the Cardigan and the Pembroke, each named for the counties in Wales

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

 where they originated. The only difference to those unfamiliar with the breed often appears to be that the Cardigan Welsh corgi has a tail, while the Pembroke does not.