Tansy was not into sports. The little border collie, a rescue, didn’t care for agility trials or flyball. But her adopted family—with two other border collies already in the house—did them all the time. Border collies are working dogs, the elite athletes of the canine universe. They go a little nuts without something to do. After a little consternation, Tansy's new owner Robin Queen, a linguist at the University of Michigan, got some advice: sheep.