I drive a couple of hundred miles each week so my border collies can embrace their destiny—or is it their ancestry?—by herding sheep at a farm. When I'm there, I'm always amazed at the scores of people who show up with all sorts of dogs, from avid herding breeds to bewildered mutts. Their owners are all eager to expose them to the ancient art. "I do agility, obedience, and therapy dog training," the owner of a Lab/shepherd mix told me, "and I'd love to add herding. We have Thursdays and Fridays open." America has enriched its children to the bone...