Glucosamine: A dog's body naturally produces glucosamine, which helps repair damaged cartilage and protect against joint degradation. However, as dogs age, their ability to produce natural glucosamine is diminished. For many dogs, this results in arthritis and joint pain. However, supplementing the body's naturally-occurring glucosamine with a well-sourced glucosamine supplement can help their body continue to repair damaged cartilage and keep their joints functioning well even as they approach their senior years. We included high quality glucosamine in our supplement to ensure it provides your dog with as much support as possible.