The Shetland Sheepdog, often known as the Sheltie, has been intentionally bred small. Shelties are ideally suited for the terrain of the Shetland Islands. While they resemble a rough Collie in miniature, they are not a true miniature Collie, as there are many differences in appearance.

The Shetland Sheepdog is classified in the AKC Herding Group, which means that it is an intelligent, athletic dog. Though smaller in size, measure just 12 to 16 inches at the shoulder, the Shetland Sheepdog, or Sheltie, has as much energy as many dogs two or three times its size.