I have a 13 year old Lab who has horrible arthritis in his spine and rear legs. This formula of Flexadin (these are not the same ingredients you get on other sites - this is more akin to what you'd get from the vet clinic) has done wonders for my senior dog. For the first time in 6 months he actually jumped up on my bed. He can now climb stairs with no issues, whereas before he needed to be carried down because he couldn't manage them. He seems happier which makes me happy. This started working for him in DAYS, not weeks as the package indicated. Nothing else changed for him aside from this.