Kong Extreme Tires Toughest Natural Rubber Dog Chew Toys Are One Of The Most Durable Toys On The Market And Are Perfect For Power Chewers. These Chew Toys Feature A Treat Stuffing Option To Ensure Your Dog Will Keep Coming Back To Play. Although No Toy Is Truly Indestructible Kong’S Patented Rubber Design Is One Of The Most Durable Available.Treat Holding Compartmentextremely Durable Dog Toy For Power Chewersmade In The Usaintended For Power Chewersthe Chewing Experience For Your Dog On These Durable Uniquely Shaped Sidewalls Will Also Provide Them With The Dental Benefits That Come From Healthy And Safe Chewing. Also Makes For A Great Fetch Toy With Its Unpredictable Bounce.Kong Tire Dog Toy Sizing:Small Kong Tire – 3.5” Diameter For Dogs Up To 35 Lbsmedium Kong Tire – 4.5” Diameter For Dogs 30-65 Lbs