The KONG unique, ultra-durable, all-natural rubber formula is designed for determined chewers, while the erratic bounce fulfills a dog’s need to play. Want to extend playtime?  Be sure to stuff with tempting bits of kibble and entice with a dash of peanut butter. Add to the fun by adding KONG Snacks and top with KONG Easy Treat. Stuff and Freeze for a longer-lasting challenge.