How long have you had him?? New hampsters shouldn't be handled for AT LEAST a week after they're brought home so they can adjust to their new environment. That having been said, some hampsters are just "meaner" than others. While working at PetCo I always HATED picking up hampsters for customers who wanted to buy them because I got bit so many times I just started using a cup to scoop them up in when a customer wanted one or to clean out their cages. A glove might work but depending on the thickness they might be able to bite through them too.