Peewee the tiny hamster could wriggle himself into the record books - he's no taller than a 50p piece!
At nine weeks old, he's fully grown but is only an inch long and weighs less than an ounce.
Owner Mandy Bower, who breeds the rodents, says Peewee might be small but he has a big attitiude.
"He's a bit bossy with the others," she said. "He's always first to the feeding bowl, the others have to eat their food around him.