hardy breed of herding dog known for its unique “fading” puppies, which may be born dark and lighten significantly with age; long to medium-length shaggy yet wispy coat follows natural line of body and may be black, blue, brown, or fawn with or without white markings; ears are long, shaggy, and hang down side of head, seeming to blend with rest of body; tail is long, furry, and carried low; eyes are large and dark, with a bright, inquiring expression; adult stands 20–22 in. (51–56 cm) tall at shoulders and weighs 40–60 lbs (18–27 kg); major use is as drover of cattle; probably descended from Komondor of central Europe but now associated with Great Britain; boisterous demeanor; also called highland collie, mountain collie, and hairy mou'ed collie.