I gave each of mine a Benebone, a plastic wishbone-shaped bone. They are aggressive chewers and now I see that they are chewing them down. I found a few plastic particles on the floor but I assume some of that is getting into them, which alarms me. A little internet reading (I know, not always reliable) indicates that these bones are not safe, ingesting plastic plus hard on the teeth. I've also read that the real bones sold at the pet stores are also unsafe for any dog. Sooo... what do your BD's chew on?