My 11 year old paint has started to pack on the pounds. I'm trying to keep a riding regiment to help him lose weight but other than that what can I do differently with his diet to reduce his weight without using a supplement? I live in Colorado, so I want him to get enough food to stay warm (he's not stalled) throughout the night. He also has full access to about 5 acres of land. Right now we give him 2 flakes of grass hay, morning and night. I've tried to cut down his food and work him more frequently but it hasn't done the trick. Thanks for the help!