I have two cats. One that is 12 years old with arthritis and constipation problems, and one that is 8 years old with colitis. After changing the diet to include Nature’s Premium Elk meat with the Elk Velvet Antler, both cats have greatly improved health. It’s like a miracle!! The older cat now has no constipation problems and her limp is almost gone. And the other cat, his colitis appears to be gone. There is no symptoms of colitis at all. It’s almost hard to believe: if I had not seen it with my own eyes it would be hard to believe. It’s like a miracle!! I highly recommend Nature’s Premium Elk meat with Elk Velvet Antler.