Great advice, everyone! I also have a senior QH gelding, 15 yrs., and recently my vet suggested a senior feed supplement. I checked out the different types on-line, and Triple Crown looks like the best one for Sunny's needs. He still eats hay, but isn't getting the full nutritional value, so started dropping weight. I plan on feeding hay with the supplement, and the Triple Crown website ( Triple Crown Nutrition - Senior Formula
) has the suggested amounts to use as supplement, and a lot of info on their products, more so than other manufacturers.