A Welsh Terrier is a medium-sized dog breed which has a very distinctive wire-textured coat; it appears like that of an Airedale Terrier. The dog has a compact, sturdy body with a tan head, legs and belly; there is a black or grizzle jacket as well. Most often, the tail of the dog is docked and this provides the dog with an overall square look; the dog is as long as it is tall. Since the dog is long-legged, it has a typical terrier gait, which looks almost effortless. The personality of a Welsh Terrier is one of great courage and spirit, the dog strives to please the owner and is capable of great patience. The dog has a very distinguished "Welsh Terrier Expression," which can best be described as confident and alert.

The Welsh Terrier has extra hair at the muzzle, which is half the length of the distance between the nose and back of the head. Both the muzzle and nose of the dog have a squared off appearance. The Welsh Terrier nose is black, as are the lips. The teeth must meet in a perfect scissor bite, though some judges will not penalize a level bite. The neck is medium-sized and thick, slightly arched without excess skin around the throat. The Welsh Terrier breed has a leveled top-line, a moderately wide chest and a short, strong loin. The tail is docked and carried high on the back of the rump.

Males of the breed stand between 15 and 15