Try putting his hay in a small mesh hay bag. Because this slows the horse down he better digests the hay he's getting. With horses, the faster in, the faster out. Chick's sells these. If you stuff two, they will last from morning until late afternoon. I have corner feeders, not the pans but large triangular shelves made of plywood with a small lip around the three sides to catch feed from rolling off. The area of this is about 3 times what a plastic corner feeder has. I scatter the pellets and the horses seem to enjoy nibbling. Pellets are easy to bolt down and again, fast in, fast out.