Back home in Arizona, the world's tallest dog gets royal treatment. He even sleeps in his own queen-size bed. "We originally started him in a dog crate. Then, he outgrew that, and he went to a twin-size bed," David says. "Within about a year, he outgrew that."

Watch Giant George in action.

Every month, David says George chows down on $250 to $300 worth of dog food and treats. "He's so tall, he can actually reach down into the sink and get a treat," David says.