The Bristle Bone is a durable treat-holding chew toy for dogs. The rubber and nylon surfaces firmly grip Busy Buddy treat ring refills to encourage chewing to help clean teeth. Hard chew strength is suitable for determined chewers. Dishwasher safe, top rack only. Natural rawhide treat rings are included with the Bristle Bone. Treats are also available separately in refill packs in a variety of flavor options.