We still leave him on pasture or keep hay in front of him. He grazes all day long and chews on these rolls of grass/hay, and then spits them out and starts that all over. I think it's a mental thing for horses that they need to graze and be chewing on something. That's the thing I would worry about with a horse on full ration pelleted feed. I think if they didn't get their 'chewing time' in, they'd probably chew on anything handy.