A Veterinarian was sick and went to see the doctor.
The doctor asked him all the usual questions about symptoms etc., when he interrupted him: "Hey look, I am a Vet - *I* don't need to ask my patients all these questions. I can tell what is wrong just by looking." He added, "Why can't you?"
The doctor nodded, stood back, looked him up and down, quickly wrote out a prescription, handed it to him, and said, "There you are. ...Of course, if *that* does not work, we'll have to have you put down."