Blue merle Shelties will have gray, tan, and white double coats. This is usually caused when the dog has at least one tri-color patterned parent. Bi-Blue Shelties have no tan colors. They are only ...

The Shetland Sheepdog is a herding dog that's also called the Sheltie. This breed ranges in size from small to medium and has a variety of coat colors, like tri-color, blue merle, and sable.