Shetland Sheepdog
The original Shetland Sheepdog was of Spitz type, similar to the Icelandic Sheepdog and other Scandinavian dogs. However, in the course of development in England as a pet breed, it was heavily crossed with other dogs including the Rough Collie and the Pomeranian, and the modern Shetland or "Sheltie" now resembles a miniature Rough Collie. The original type of working Shetland Sheepdog does not survive. Modern Shetland Sheepdogs are used primarily as pets, but excel at canine sports such as agility and obedience. Most retain some herding instinct, to varying degrees.
Read more about this topic: Shetland Animal Breeds