Cross-Eyed Dog

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

"Alright," says the vet, "let's have a look at him."

So he picks the dog up and has a good look at its eyes.

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

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

"No, because he's darn heavy!"