The Rough Collie or Long-Haired Collie is a British breed of long-coated herding dog of medium to large size. It is identical to the Smooth Collie in all respects but the length of the coat. Dogs of both breeds were bred for herding sheep in Scotland. In the twenty-first century the Rough Collie is commonly kept as a companion dog, or may be bred for showing. The recognised coat colours are sable or merle in various shades, tri-coloured or colour-headed white. The Rough Collie is similar in appearance to the smaller Shetland Sheepdog, but a genetic link between the two breeds is not established.

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