A physician was driving through a village when he saw a man amusing a crowd with the antics of his trick dog. The doctor pulled up and said: "My dear man, how do you manage to train your dog that way? I can't teach mine a single trick."
The man glanced up with a simple rustic look and replied: "Well, you see, it's this way; you have to know more'n the dog or you can't learn him nothin'."