Originally Posted by usandpets
You can't just look at one thing to tell what a horse is telling you. You have to look at any and all of the other things they are doing. How are his ears? Are they pinned or up? Is his tail swishing, like swatting a fly? Either of those could mean that he is irritated and wants to be left alone.
If he is just stomping or pawing, he may be excited or is trying to find a comfortable position to eat. Is he lame in that leg? Are his hooves uneven or need a trim?
It is possible that he is testing you. Horses in a new setting or herd know that they are at the bottom of the pecking order. After some time, be it a couple weeks or a couple months, they will start to test the waters if the can move up, whether it is with new horses or new owners. This doesn't only show up at feeding time but may start there. Has he changed in behavior while leading or riding?
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Body/ear language will give you more insight on his intentions
If he is stomping and pinning his ears -- run him off his feed aggressively --- it's your food and you are allowing him to have it but only if he minds his manners