DESC: Specially designed for young puppies, each bone in this package is recommended for specific stages of your puppy's teething. For Stage 1 (from 2 months) use the Puppy Bone. This chew is more pliable than regular Nylabones and is specifically designed to assist in the growth and development of teeth and jaws. For Stage 2 (from 3 months) use the Healthy Edibles Bacon Flavored Bone. This healthy treat provides a safe and healthy alternative to rawhide and processed animal parts. For Stage 3 (from 4 months) use the Chicken Flavored Durable Bone. This bone is recommended for growing puppies whose jaws are getting stronger. Longer lasting than the Puppy Bone, this chew is designed for more aggressive chewers.