The KONG® Extreme dog toy shows the most durable strength of KONG® rubber. Designed for the toughest of chewers, the KONG® Extreme provides enrichment and helps satisfy a dog's instinctual needs. KONG®'s unique, ultra-durable, all-natural rubber formula is designed for determined chewers, while the fun bounce satisfies a dog's play need. Would you like to extend the fun? Make sure to fill it with tempting chunks and a lick of peanut butter. For more fun, add KONG® Snacks with KONG® Easy Treat. Fill and freeze for lasting pleasure!