I'm wondering if there's something safe I can get for my dog to chew? He really loves rawhides but I found out recently that they're not particularly safe. He has a nylon bone that he was enthusiastic about for a little while, but he lost interest in an hour and has never gone back to it. I worry about giving him hard bones because he's a powerful, determined chewer. I'm just afraid he'll splinter off little bits and hurt himself.