I don't disagree with those who are suggesting getting help from a professional to show the opster how to deal with this situation, but I do think it would be a bit more helpful here, if the opster would expound on the first post to clarify a few things. For example, when is this horse chasing you? Is it only during feeding time or if there is food already in front of it? Does it occur any time you enter stall / corral / paddock / pasture? Horses and handlers both very in knowledge and experience and it is hard to know exactly which method to utilize without seeing the opster and said horse interact in person. Not all aggression is fear related. Some animals can and do learn that they can walk all over their owners, simply because the owners either unwittingly allowed the horse to take the lead or through training with the intention of the animal learning a bad habit and in this situation a dangerous one. If the owner / handler isn't in charge, the horse is.