Nylabone Puppy Bone Starter Kit features three Nylabone chews specifically selected for specific stages of your puppy's teething. Stage One (from two months): Flexible Puppybone: Flexible Puppybone is recommended for young puppies. This chew is more pliable than a Durable and is specifically designed to assist in the growth and development of teeth and jaws. Stage Two (from three months): Healthy Edibles Bacon Flavor Bone: Healthy Edibles Bacon Flavor Bone edible dog treat is recommended for older puppies. These healthy, edible treats provide a safe and healthy alternative to rawhide and processed animal parts.Stage Three (from four months): Nylabone Durable Chicken Bone: Chicken Flavor Durable Nylabone is recommended for growing puppies whose jaws are getting stronger. Longer lasting than the Flexible Puppybone, this chew is designed for more aggressive chewers.