Give your tough chewer a challenge with the KONG Extreme Dog Toy, representing the most durable strength of KONG rubber. This plaything is designed for the toughest chewer and offer enrichment to help satisfy your pups instinctual needs. 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 play time? And to add some extra fun into the mix, this toy can be stuffed with KONG’s Stuff’N Easy Treat, Snacks or Ziggies (sold separately) or any of his favorite rewards like peanut butter, yogurt or kibble!