"[Point of view] you are a sheepdog with no sheep," Bailey's owner, Jenni Carr, said in the post. The yoga trainer captioned the video: "Herding ... problem here. My border collie herds the ...

When faced with the reality that herding is deep in their dogs' DNA, many owners of border collies wind up on a farm, renting -- or buying -- their dogs some sheep. WSJ's Michael M. Phillips reports.