Your Dog's New Favorite Peanut Butter Bone! Only Natural Pet Collagen Beef Stick Peanut Butter Flavor Dog Bones takes our original collagen sticks and adds a twist! With the addition of natural peanut butter flavor to your dog's favorite bone they are sure to be pleased. Our collagen sticks are made up of 95% collagen so they not only taste good but they are good for your dog as well. Made for all breed sizes, these peanut butter flavor dog bones come in 6 and 12 inch options. Grain-free and rawhide-free our collagen sticks are easily digestible and won't upset your dog's tummy. Discover your dog's favorite peanut butter flavor bone today with the Only Natural Pet Collagen Beef Stick Peanut Butter Flavor Dog Bone.