He use to be on his wheel alot but now he is never on it! :(
difficult stuff try searching over yahoo or google this can help
Hello I am a veterinary in Queensland so this isn't the first time i have heard this it is normal because your hamster has gotten lazy try to train him onto it again with his favourite treat maybe small slices of carrot put him on the wheel and reward then make him run and reward just train him back into the habit