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.