Dog toy made with gentle but durable Senior forumla for older dogs. The KONG Senior is made with KONG's gentle but durable Senior formula for older dogs. Stuff it with treats/snacks to get your dog to chew on a toy thats perfect for aging teeth and jaws. Reestablishes play and exercise. Recommended by veterinarians, trainers and dog enthusiasts. Made in USA. Available in three sizes: Small, Medium, Large.