The KONG Extreme dog toy is made from the strongest, most durable KONG rubber. Designed for the toughest of chewers, KONG Extreme offers a real challenge to the dog, and allows him to satisfy his instincts. KONG's exclusive 100% natural rubber is ultra-resistant and designed for determined chewers, while the irregular bounce satisfies dogs' need to play. Want to extend your playtime? Fill the toy with appetizing dog kibble and a lick of peanut butter. Better still, add KONG Snacks and finish with a little KONG Easy Treat paste. Garnish and freeze for a challenge that lasts longer.