I have 8 rescue dogs, several are older. This product was recommended by my vet. I have never had a supplement that worked as well as this one. I only wish something of equal quality was available for people. I have seen dogs that I was close to a decision to euthanize because they couldn't get up without assistance or walk without severe pain make remarkable recoveries after a month or so on this supplement. I have recommended it to friends and customers who experienced the same results. If you have a dog with joint problems, please give them a chance to have more mobility without pain by giving this a try. I would never have believed it if I hadn't seen it, not once, but in many cases. It does take anywhere from a few weeks to a couple of months for full results. Chronic pain causes so many other problems including changes in behavior, accidents in housebroken dogs (too painful to get up to go outside), depression, anxiety, aggression, loss of appetite and more. I can't say enough about the incredible results I have seen. Best of all, it is not a drug that masks pain. It is a nutritional supplement to help their body recover as much as possible. Please give it a try if you care about your pets. Dogs love them - tastes like a treat.