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Barkworthies beef lung chips are all-natural cow lung dog treats. This light, crunchy treat has no additional ingredients and is naturally low in a fat and high in protein. Our beef lung chips have been baked to perfection leaving the all-natural taste and texture that your dog will be sure to love. Barkworthies beef lung chips are made from FDA approved beef from right here in the U.S.A! As With all of our products, Barkworthies are additive-free, chemical-free, and preservative- free dog chews. In fact, most Barkworthies products are single-ingredient chews, making them all natural, healthy and safe for your dog.