The Xtreme Kong for Tenacious Chewers is the most durable, strong,
rubber dog toy on the market. The super-thick, ultra strong compound is
specially designed for your big dog. Stuff your Kong dog toy with yummy
treats such as, dog biscuits, peanut butter and cheese, for hours of
chewing fun. Used and recommended by police K-9, drug enforcement,
military K-9 teams, veterinarians, AKC and Schutzhund trainers.
Xtreme Kong for Tenacious Chewers comes in four sizes, small (3"), medium (3 1/2), original (4"), x large (5") or king kong (6").