Originating in the 1800s,  the breed is now well known through the works of author Albert Payson Terhune, beginning with books about Lad, and through Lassie novels, movies, and television shows. Rough Collies generally come in shades of sable and white (sometimes mahogany), blue merle, tri-colored, and white. The breed has a distinctive long tapered snout and tipped ears. The muzzle is well rounded, and never square. There is considerable variation in the color of the head, however. The eyes are medium-sized and almond shaped.