KONG's exclusive red natural rubber is puncture resistant, super bouncy, and chewer friendly. It is unmatched for resilience, durability, and bounce. KONG® satisfies a dog's natural need to chew and also cleans teeth and conditions gums. The thick, flexible walls keep springing back for more! KONG® rubber is non-toxic, nonabrasive, non-splintering, and does not get sharp when chewed. Kongs® are widely used for therapy and prevention of boredom, separation anxiety and other behavioral issues. Regular use of Kongs can also improve oral health. Their unpredictable bounce lures most dogs into a game of chase, catch and chew. The hollow center can be filled with food and treats. A dab of peanut butter spread around the inside is very effective. Providing food and/or treat stuffed KONG's® for your dogs can keep them contentedly busy (working) and out of trouble for long periods of time. Add more stuffed Kongs to increase their work time. KONG® toys are enthusiastically used and recommended by veterinarians, trainers, dog professionals and satisfied customers world wide.