Puppy KONGs have a special teething formula which makes the rubber softer for young, brittle teeth, but still durable like the original red KONG. Ideal to use during a puppy's teething stage, they can be stuffed with tantalising treats to keep puppy happy and stimulated when left alone. Available in three sizes: small, medium and large. For use up to nine months of age. Kongs can be stuffed with food and treats to help prevent boredom and separation anxiety. Freeze the Kong with its contents to sooth gums! Kong STUFF'N pastes and treats are available, or you can come up with your own fillings.