Made from only one ingredient, Only Natural Pet Cow Lungs are sourced from the same quality, free range, grass fed cattle. Making it a yummy chew that is only natural, high protein, low fat organ meat and contain no added fillers, preservatives, flavors, hormones or additives. These Cow Lungs have a crunchy, chewy consistency that I gave Alle daily. If your dog is looking for a chew for your dog but they may have some dental issues this would be a great choice. Alle shared some of these treats with her senior cousin dog, Toby, whom also woofed them down with no problem. They do have a slight odor but they were woofed down so fast it didn't bother me.