My 16 year old Paint Quarter Horse might be moving with me to a new barn. I've never had to choose my grain, so I don't know what kind to get. He gets worked close to 7 days a week, jumping or English flat. I work him about an hour each day. He is 15 hands high, and about 1,000lbs. I don't know if this helps with your answer but I hope you can answer. Please reply. Thank you!