Beef Lung is a great source of high quality protein and is low in fat. These Beef Lung steaks also contain Vitamins C and B12, Iron, Zin and Collagen! Which are essential for a healthy brain, immune system, produces energy, there are many benefits for the dog. With air drying our treats leaving them 100% natural , they are left with their natural enticing smell and taste the dog won't be able to resist!