I got mine from the vet and then ordered them from amazon--however, I have also done, at the direction of my vet, the following--get powdered glucomsamine used for horses in a feed store--like Tractor supply. Sprinkle several tablespoons on top of their food and/or mix it in. I had my doubts, but my then-aging malamute responded beautifully within a few weeks. The change in his gait was visible, he was pretty pain free from his arthritis until he really was near the end. I have a 6 year old BC now and I am going to go try and hunt the powder down as I do not relish trying to get my little picky eater to down a pill.