The KONG™ Extreme Goodie Bone is the answer for aggressive chewers, it has a classic bone shape and is designed with the same goodie grippers you find in other popular KONG™ toys. Your dog can chew on it plain or you can place treats in it for extra Incentive. The KONG™ Extreme Goodie bone is made from ultra-tough rubber and can withstand even the toughest dogs. Available in Medium or Large