A man took his Rottweiler to the vet. "My dog's cross-eyed, is there anything you can do for him?"

"Well," said the vet, "lets have a look at him."

So he picks the dog up and has a good look at its eyes. "Hmm," says the vet, "I'm going to have to put him down"

"Just because he's cross-eyed?" says the man.

"No, because he's heavy," says the vet.