By Phoebe
Date 04.10.05 21:33 UTC
Don't worry in the least - he'll be fine once he's 8 weeks old. Often a litter of pups can vary alarmingly in size and they even out naturally as they grow. I've sen puppies so fat up to 4 weeks old that they look like a beanbag with a leg at each corner! Don't restrict his food, but make sure the others get their fill if he pushes them out of the way.