Liver flavored Nylabone Durable bone with baked-in flavor particles. These unique therapeutic toys are designed to satisfy the chewing instinct of even the most aggressive chewers. Recommended by leading dog authorities, Nylabone Durables are designed for powerful chewers and last longer than many other chew products. They help keep your dogs teeth clean while massaging gums at the same time. Contains real liver meal, which is irresistible to dogs!