Collie \Col"lie\, n. [Gael. cuilean whelp, puppy, dog.]

(Zo["o]l.) The Scotch shepherd dog. There are two breeds, the rough-haired and smooth-haired. It is remarkable for its intelligence, displayed especially in caring for flocks. [Written also colly, colley.]

Source: Webster's Revised Unabridged Dictionary (1913)