We were told about Connectin at a local pet supply store. Our dog is ten years old and has the usual old age arthritis. Shes on Rimadyl. But this stuff made a noticeable difference in just a few days. Normally shed be limping by the end of the day. Not as much now. The limping now is only after those days shes played really hard. She is a ball/fetch monster and needs her play sessions for her mental well-being. So if your dog has arthritis, try this. Its definitely made a difference for our pup.