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.
"I think he stopped growing at three weeks old, all his brothers and sisters continued growing to around four or six inches, but he just stopped."
The Guinness Book of Records said there are records for the oldest and the biggest hamster, but none for the smallest.
Now global checks are being made to see if tiny Peewee is a real record-breaker.
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