I have an 8 year old yellow Lab that would not jump or hardly get up and play at all. I am in the pet food business and in stores delivering our products regularly. The owners of a local store highly recommended your product to me and offered a guarantee on a trial size bottle. I was shocked to see that only after a few days, my lab is now jumping up on the bed with no problem. I am going back in this week and will pay for the small trial size bottle the pet store gave me and will buy an economy size bottle right away. Thank you for a great product from someone who is even in the industry!