KONG Extreme Dog Toy. Finally a KONG toy for extreme dogs! Made with a gentle rubber formula that is easy teeth and works jaw muscles, the KONG Extreme Dog Toy is a great way to help your dog feel like a puppy again. The KONG Dog Toy establishes play and exercise behavior that can be beneficial to your dog both mentally and physically. Use with KONG Stuff'N Treats (sold separately) or peanut butter for added interest and prolonged activity. KONG rubber is non-toxic, non-splintering, and does not get sharp when chewed. Widely used for therapy and prevention of boredom, separation anxiety and other behavioral issues, KONG chew toys are enthusiastically used and recommended by veterinarians, trainers, dog professionals and satisfied customers world wide. Keep your senior dog young at heart and active with this specially formulated rubber chew toy and treat dispenser. Also suitable for young puppies, teething small breeds. See our puppy and senior dog option on this site too.