I have used it since the middle of last year. Based on suggestions from this board, I also use the Springtime joint supplements and Bug off with the Nupro. Kayla has moderate HD and is pretty active-in addition to obedience and rally trials, we started doing agility in Feb and she is going strong.
She has also not skipped a meal since I started the Nupro-she loves it.
i vote for Canine Complete holistic supplement. i think its the best all round supplement on the market. Nupro is a good product, but doesn't have alot of what CC has.,
the only other supplement i can recommend would be something from "missing link"