Are Dog Breeds Actually Different Species?: Scientific American

Are Dog Breeds Actually Different Species?: Scientific American: "Amazingly, right now Chihuahuas are still considered C. lupus familiaris, a subspecies of wolf. And calling a Chihuahua a wolf is like calling someone at the Discovery Institute a scientist."

Not a bad idea. I have always thought of the working breeds a different species from the lap dogs, the breeding barrier being the matron who wouldn't let her beloved fluffy out of his upholstered carrier long enough to sniff a working breed. The question of hunting vs herding dogs is a bit more difficult, but again I would argue that temperament population isolation due to work environment would qualify them for speciation.