A man took his Rottweiler to the vet and said "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.