My little chew does well with Nylabone Flexis. My very aggressive 16lb chewer has just been switched to another type of Nyla. Mayve it's the Dura type. I didn't like how closely he had to be watched with the other ones. Still little pieces come off of this one. Don't like that abokut it. But no animal parts are allowed here, so it will have to do... It is a tooth breaker, but his teeth are insured, so I guess it's okay.