The 6" Braided Collagen stick is for small dogs and the 10-12" Braided Collagen stick is for medium to large dogs. Collagen sticks are made from inner tissue for quicker digestibility. More surface area for cleaning your pets teeth and massaging gums. 100% naturally loaded with Glucosamine and Chondroitin clinically proven to aid your pet's hips and joints. Made from free range grass fed beef.