My dwarf hotot won't eat timothy hay or orchard grass.?

I have a one year old dwarf Hotot who will not eat timothy hay or orchard grass. All he does it chew it up into small pieces the only grass he likes is alfalfa but I know it is too rich to feed him all the time. He doesn't even like alfalfa pellets very much but will eat these over grass. I don't know what to do; if anyone can help me I'm afraid my little bunyuns is going to have stomach problems if he doesn't start eating more grass. I do feed him dark green lettuce and I also keep a kaytee honey log for him to chew on. He eats all his fresh veggies and his treat log but I cannot for the life of me get that bunny to eat grass.