A man takes his Rottweiler to the vet.
"My dog's cross-eyed, is there anything you can do for him?"
asks the man.
"Well," says the vet, "let's have a look at him."
So he picks the dog up and examines his eyes, then checks his teeth.
Finally, the vet says "I'm going to have to put him down."
"What? Because he's cross-eyed?"
asks the bewildered man.
"No, because he's really heavy." answers the vet!