Double the fun with two-bones-in-one! BarkBone? Natural Instincts Flavorit Nylon Chews are infused to the core with irresistible non-allergenic peanut butter flavor that releases as your dog chews. This classic bone shape nylon chew is curved for easy pick up and features patented flavor cells that can be filled with your dog's favorite spreadable treats for a long-lasting chew sessions. Available in three sizes: Small, Medium, and Large. Chews are non-toxic and non-allergenic. Proudly made in the USA!