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.