any of a breed of large, long-haired dog with a long, narrow head: first bred in Scotland for herding sheep
Origin of colliesaid to be ; from coaly, coal-black, from the color of some of the breed
A medium-to-large dog of a breed originating in Scotland as a sheepdog, having a long narrow muzzle and either a long rough coat or a short smooth coat, depending on the variety.
Origin of collieScots, perhaps variant of colly, like coal, from Middle English col, coal; see coal.
Perhaps originally from coal, with reference to its colour.