Welsh terrier, breed of terrier native to Wales, where it has been used as a hunter of foxes, otters, and badgers. The Welsh terrier is a small, Airedale-like dog with a characteristically game and energetic nature. It has a hard, wiry coat, usually black-and-tan, stands about 15 inches (38 cm) high, and weighs about 20 pounds (9 kg). Wide-set eyes and a flat skull give the breed a distinctive, “intelligent” expression.