They are 100% natural and air-dried to lock in nutrients and flavor, according to Pets & Friends and others. They contain no artificial additives or preservatives. High protein: These treats are high in protein (52%), which helps support strong muscles and provide energy. Gluten-free: They are 100% gluten-free, making them suitable for dogs with sensitivities, The chewy texture helps satisfy a dog's natural urge to chew, keeping them occupied.