The Rat Terrier is a multipurpose companion dog that is capable of hunting rodents and vermin above and below ground as well as coursing small game. He is a sturdy, compact, small-to-medium sized parti-colored dog giving the appearance of elegance and athleticism. His short, smooth coat may come in any variation of pied patterning. Pied is described as comparatively large patches of one or more colors in combination with white. Acceptable colors, with or without “tan points”, include the predominate black, or chocolate, red, apricot, blue, fawn, tan, or lemon.

The Rat Terrier has sometimes been described as having a dual personality. He is a fearless, tenacious hunter with seemingly unlimited energy. When he is not hunting, however, the Rat Terrier is an exceptionally friendly companion, getting along well with children, other dogs, and even cats.