The KONG Extreme dog toy represents the most durable strength of KONG rubber. Designed for the toughest of chewers, the KONG Extreme offers enrichment and helps satisfy dogs’ instinctual needs. The KONG unique, ultra-durable, natural rubber formula is designed for determined chewers, while the erratic bounce fulfills a dog’s need to play. Want to extend play time? 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. Mentally stimulating toy; offering enrichment by helping satisfy dogs’ instinctual needs KONG black rubber formula is specifically designed for power chewers Unpredictable bounce for games of fetch Great for stuffing with KONG Easy Treat; Snacks or Ziggies Recommended worldwide by Veterinarians; Trainers; and dog enthusiasts Natural rubber Made in the USA. Globally Sourced Materials. Check out the Kong Brush for easy cleaning! Size Recommendation: Small: Up to 20 lb / 9 kg Medium: 15-35 lb / 7-16 kg Large: 30-65 lb / 13-30 kg X-Large: 60-90 lb / 27-41 kg XX-Large: 85+ lb / 38+ kg