The KONG Classic is the gold standard of dog toys and has become the staple for dogs around the world for over forty years. Offering enrichment by helping satisfy dogs’ instinctual needs, the KONG Classic’s unique natural red rubber formula is ultra-durable with an erratic bounce that is ideal for dogs that like to chew while also fulfilling 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 topping with KONG Easy Treat. Mentally stimulating toy; offering enrichment by helping satisfy dogs’ instinctual needs KONG classic red rubber formula for average chewers Unpredictable bounce for games of fetch Great for stuffing with KONG Easy Treat; Snacks or Ziggies Natural rubber Recommended by veterinarians and trainers worldwide Made in the USA. Globally Sourced Materials. Check out the Kong Brush for easy cleaning! Size Recommendation: X-Small: Up to 5 lb / 2 kg 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