The Bearded Collie is a medium sized dog with a medium length coat that follows the natural lines of the body and allows plenty of daylight under the body. The body is long and lean, and, though strongly made, does not appear heavy. A bright inquiring expression is a distinctive feature of the breed.
The Border Collie was originally called the "Scotch Sheep Dog" and originated in Northumberland along the borders of Scotland and England. It is a descendant from dogs used by the Vikings to herd reindeer, the old British droving breeds, with spaniel added.
While the AKC has a breed they call "Collie", in fact collie dogs are a distinctive type of herding dog including many related landraces and formal breeds. There are usually major distinctions between show dogs and those bred for herding trials or dog sports.
Shetland sheepdogs take their name from Shetland, the Scottish archipelago where the breed originated in the late 1800s. The small, agile sheepdogs were developed by shepherds there to withstand rough weather and rocky terrain. Sheltie ancestors are believed to be border collies, Scottish collies and spitz-type dogs — or maybe even Pomeranians.