The KONG® Senior dog toy is tailored for an aging dog's chewing and playing. The unique, all natural KONG® Senior rubber formula is designed for teeth and gums that have been chewing for years. Designed to provide a soft and comfortable chew output while providing enrichment and satisfying an older dog's instinctive play need. The bounce effect makes it perfect for dogs who are still playing as they age. For longer fun, make sure to fill the toy with chunks and a lick of peanut butter (or with a filling according to one of the numerous recipes available on the internet). For more fun, add KONG® Snacks with KONG® Easy Treat. Is your dog still looking for a mental challenge? Freeze it for a treat that lasts longer!