The Kong Extreme is a nontoxic, dishwasher-safe rubber toy with a hollow center designed for the most powerful jaws. This is one of the toughest toys we sell! This black Kong Extreme is appropriate for medium- to large-sized aggressive chewers, including smaller Labs and golden retrievers. Chewing Kongs helps promote strong jaws, clean teeth, and general oral health. Even aggressive "power chewers" will find it hard to bite through carbon-formula Ultra Flex, and dogs with separation anxiety or problem behaviors like barking and digging will especially benefit from the mental and physical stimulation. When stuffed with food, it provides dogs with a healthy outlet for their natural desire to chew and lick. You can stuff KONGs with almost any kind of food your dog likes. Feed him his meals in a KONG by mixing his regular kibble with a little canned dog food, cottage cheese, yogurt, peanut butter, canned pumpkin or mashed banana. After spooning the mixture into the KONG, you can use a bit of cream cheese or peanut butter to seal everything in. You can also fill your dog’s KONGs with special snacks to supplement his diet.