Kerry blue terrier, breed of large, sturdy terrier perfected in Ireland more than 100 years ago. It stands from 17 to 19 in. (43.2–48.3 cm) high at the shoulder and weighs from 30 to 40 lb (13.6–18.2 kg). Its dense coat is soft and wavy, never harsh, and may be any shade of blue-gray or gray-blue. A truly all-purpose working terrier, the Kerry blue was used to hunt small game, destroy vermin, retrieve on land and water, and herd sheep and cattle. Today it is a popular house pet and show competitor. See dog.