It's not just a dog toy, it's a KONG. KONG Extreme is the most durable version of our original KONG toy. The ultra-strong, ultra-durable, black rubber compound is recommended for the most powerful chewers. Our super-bouncy, black natural rubber compound is unequaled for dogs who like to chew. Stuffing healthy treats into a KONG keeps dogs happily working and out of trouble for long periods of time.