OT Putting my cross eyed dog down

A man takes his Rottweiler to the vet.

"My dog is cross-eyed," the man says. "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 and ears and then checks
his teeth. Finally, he says, "I'm going to have to put him down."

"What?" The man was astonished. "Why? Because he's cross-eyed?"

"No," said the vet, "because he's really heavy!"