When Jag and Chester were living with my parents, Jag hurt his back REALLY badly, to the point where he was shaking uncontrollably and they had to give him a cortisone injection at the vet. My parents immediately started them on a Glucosamine supplement. Problem is, my parents aren't worried in the least about the ingredients in the dogs' food, and so they got a $15 bottle from Wal-Mart, and the very first ingredient was Brewer's Yeast. Does anyone know of a better quality supplement that I could give them?