I have a 160Lb. bulldog and he chews A LOT of bones. It costs me $100 a month just to keep him in bones. He really loves those huge mammoth bones (cow femur), as well as, the extra large knuckle bones. His teeth are pearly- white from all that chewing he does, and he also doesn't end up chewing on things that he shouldn't. These two types are the only ones that I've found, that he can't completely destroy within the hour...they actually last several days.
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