Alright, alright...I learned something new in this thread
I suggested raw marrow bones....but myself won't be giving them anymore. It's been at least 4 months since Rusty had one. I always gave them frozen. They were not his favorite and more often than not he had more fun burying them in the yard.
I do not want to deal with a broken or cracked tooth.
There are just so many other things he can enjoy....I might check out a sheep head like Carmen suggested! He does like the crunch, crunch of those smaller more plyable bones like the necks.