A man took his St. Bernard to the vet and said to the vet: "my dog's cross-eyed. Is there anything you can do for it?"

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

So he picks the dog up by its ears & has a good look at it's yes.

"Well" says the vet "I'm going to have to put him down."

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

"No," the vet answers, "because he's very heavy."