Busy Buddy Bristle Bone is a fun dental toy your dog will love to chew! Durable nylon bristles and rubber nubs clean teeth as your dog chews. It comes with two Gnawhide® treats in the bone and two treat refills—simply unscrew the end of the Bristle Bone to slide a new Gnawhide treat into the mix of bristles and nubs. More refills are available. The Bristle Bone is available in three sizes.