The Shetland Sheepdog, often known as the Sheltie, is a breed of herding dog that originated in the Shetland Islands of Scotland. The original sheepdog of Shetland was a Spitz-type dog, probably similar to the modern Icelandic Sheepdog. This dog was crossed with mainland working collies brought to the islands, and then after being brought to England, it was further extensively crossed with the Rough Collie, and other breeds including some or all of the extinct Greenland Yakki, the King Charles Spaniel (not the Cavalier), the Pomeranian, The English Kennel Club describes three different colors: 'tricolor, blue merle, and sable (ranging from golden through mahogany), marked with varying amounts of white and/or tan.' In the show ring, blue merles may have blue eyes; all other colors must have brown eyes.