A man take his dog to the vet, and then...

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

"Well," says the vet, "let's have a look at him" So, he picks the dog up and examines his eyes, then teeth.

Finally, he says "I'm going to have to put him down."

"Why? Because he's cross-eyed?"

"No, because he's really heavy."