Judy Dear Judy, As you seem to realize, Ringo's behavior problem likely relates to feeding. He has learned that rushing into the barn is almost always rewarded with grain in the tub. If he can simply unlearn that association, the rushing and aggression should diminish. There probably are many ways to undo the association of coming into the barn with feed. For horses in good health and condition that are in light work like Ringo, I find the easiest way to eliminate this habit is to just stop feeding grain.
Most horses stop rushing to the stall after about a week of no reward.
If you need to feed grain, feed it somewhere else-maybe over the pasture fence, when he's on the other side of the pasture. Or you can have a delay between coming into the barn and feeding hay or grain. Horses such as this might be aggressive in the stall while you are placing the feed or hay. A simple procedure called counter-conditioning usually can eliminate that behavior. This means training the horse to do something other than rushing in order to get his feed.