Barkworthies BARK-LAMBLUNG6C6 Lamb Lung Chips 06 oz. Surp They"re packed with Vitamin A&#44; which is essential to your dog&rsquo;s liver function. Lamb Lung is also a terrific treat for dogs with sensitive stomachs. It"s also suitable to feed your pet at any stage of life - from puppy to mature adult. As with all of our products&#44; these chews are additive-free&#44; chemical-free&#44; and preservative-free. Moreover&#44; most Barkworthies products are single-ingredient chews&#44; making them 100&#37; healthy