My eleven year old lab has been eating Nutro Natural Choice Senior dog food for about 3 years now. She was on the lamb and rice for many years and then we switched her to the senior formula. Before we switched her over to the senior formula, she would run and swim with our younger lab for hours and then wake up lame the next morning. She loves to swim and chase balls, so we opted to find another brand that had some glucosamine in it that would help with her joints and mobility. Now, three years later, she is as spunky as ever and keeps up with the 3 year old and can swim circles around him. She's like the energizer buddy it seems and her morning days of lameness are gone. As with the other Nutro Natural Choice products, the bonus is less waste in yard and better nutritious ingredients.