Yes I agree as well. It sounds like his teeth are too long, perhaps he has a sore in his mouth as well. Please check with the vet, they might have to file those choppers down. I get boxes from the wholesale club for my bunnies to chew on. They also really love willow tree branches. Some tree brances are poisen, best place to check is on the House Rabbit Society web page. My two chew all the time on those boxes. I get new ones every week when shopping. They really love this special box from the store, it's thinner then most boxes and they go to town on them. Good luck. Keep us posted we all love bunnies here.