The KONG Senior Dog allows aging dogs to continue to play with their favorite toy. This toy has the same shape as the original KONG, but KONG Senior is made of a softer rubber making it gentler and more comfortable on gums and teeth. Your dog will still enjoy the unpredictable bounce when playing fetch. And add to the fun by stuffing it with KONG Stuffin Peanut Butter or their favorite treat. Kong Senior is available in two sizes (medium and large).