What is "rough collie"

n. A longhaired breed of dog originating from Scotland, originally used as sheepdog.

The Rough Collie (also known as the Long-Haired Collie) is a long coated breed of medium to large size dog that in its original form was a type of collie used and bred for herding in Scotland. Originating in the 1800s, it is now well known through the works of author Albert Payson Terhune, and through the Lassie novel, movies, and television shows. There is also a smooth-coated variety; some breed organisations, including both the American and the Canadian Kennel Clubs, consider the smooth-coat and rough-coat dogs to be variations of the same breed. Rough Collies generally come in shades of sable, merles, and tri-coloured. This breed looks like a bigger version of the Shetland Sheepdog, but they are not related.