I have a paint gelding that turned 25 this year. He has been completely retired from riding due to arthritis, but I don't want him to go completely stiff. My vet said to try a senior supplement and continue some light work in the arena. Any suggestions on a good quality supplement? I also have a 20 year old QH mare that I am going to go ahead and start on the supplement as well. Since I have begin taking in older horses on my farm, I need a supplement that is versatile for all horses.