Most terrier breeds have evolved in Great Britain and Ireland. Traditionally these hard working dogs were used to control vermin such as rats, rabbits, and foxes. Some larger terriers were also used to hunt badgers, although this practice is now outlawed.

Terriers are adept at hunting both above, and below the ground. In fact, the word terrier comes from the French word ‘terrier’, which itself is derived from the Latin word ‘terra’ meaning earth. There are notable exceptions including the Kerry Blue Terrier and Airedale, which were particularly noted for tackling river rats and otters in deep water.

The breeds’ versatility meant that different localities bred terriers suited to their hunting or vermin control needs. To change the characteristics of the breeds, terriers were often crossed with larger hunting dogs, fighting dogs, and even other terriers.

The tenacious character of early hunting terriers was often exploited by using them in sporting contests. Terriers competed in events such as clearing a pit of rats, where the dog that was fastest in killing all the rats won. In the 1700s terriers were crossed with hounds to improve their hunting, and some with fighting dog breeds.

The mid nineteenth century saw the advent of dog shows. This meant various breeds were refined from the older purpose-bred dogs, although the inherent working characteristics are still an important part of the judging process at terrier shows today. All of today's terrier breeds are bred primarily as pets, and their ‘larger than life’ characters make them great family companions. They are generally loyal and affectionate to their owners but can be "big characters" requiring a firm hand.

Countryman Fairs host a wide range of showing and field event for terriers, including the world renowned Countryman’s Weekly Champion of Champions.