The KONG Extreme dog toy is the most durable strength of KONG rubber, designed for the toughest of chewers. It offers enrichment and helps satisfy dogs' instinctual needs. The unique, ultra-durable, all-natural rubber formula is designed for determined chewers, while the erratic bounce fulfills a dog's need to play. Extend playtime by stuffing with kibble and a dash of peanut butter, or add KONG Snacks and top with KONG Easy Treat. Stuff and freeze for a longer-lasting challenge. Recommended worldwide by Veterinarians and dog enthusiasts. Made from natural rubber. This toy is ideal for use during fetch, or for your dog to play with by itself. It is available in a range of different sizes to meet different breed and weight needs.