Beef lungs can be a nutritious and healthy treat for dogs! They are a rich source of protein, iron, and other essential nutrients. Here are some benefits of feeding beef lungs to dogs. It is an excellent source of protein, which is essential for maintaining your dog's overall health and well-being. It is also a rich source of iron, which is important for healthy red blood cells and preventing anemia. Contain various vitamins and minerals, such as vitamin B12, riboflavin and selenium. Beef lungs also contain enzymes that can help support healthy digestion and gut health.