If my horse gets fed in her pen alone, either the feed's already there in the pen, or she has to back off ans wait for me to feed her. If she's out with other horses I catch her and bring her in to her feed, which I already got out and ready. She doesn't get to rush, pull, or drag me to the feed. If she does, she has to lunge on the lead rope. Stop, back up, walk, stop, back up, etc. Once she calms down and listens to me, she gets her food. Mostly she's very mannerly, but every now and then she needs a reminder. Since I have kids handling her and getting her out, I absolutely do not tolerate ANY kind of food aggression.