My pooch was diagnosed with osteoarthritis last year, right around the holidays. We noticed he was moving a bit slower and limping a little like he was favoring one hip. Sure enough, there was some joint damage. We started off with a different product that was mostly MSM. It seemed to help a little for a while, but then nothing. Now we are using this and have experienced a big difference. He's moving better, seems to be in less pain, even jogs a bit around the back yard.