This is my eight year old QH/morgan gelding. He has been leased by the girl riding him for two years now. He is a fabulous riding horse; she has been riding him english mostly and started jumping him last year (which he is really good at).
My problem is not with him as a riding horse, but when the halter is off and he is in "his" pen. He is very scary looking agressive over his fence, at feeding time, and with the vet. He has never bit anyone, but he always looks like he is trying to. He is easy to halter, lead, and do everything with. He shows very little agression in his pen toward the girl leasing him. I definitely feel he does well attaching himself to one person (although he lets anyone ride him).
He seems most aggresive with strangers (especially people who do not know horses well) and the vet. I am writing this becasue when our vet came for spring shots he basically chewed me out about what a dangerous animal he is (he raised his head and pinned his ears when the vet tried to vaccinate him - I had to use a lip chain to calm my horse because the vet wanted to sedate him - incidentally my horse did not get a general health check over as a result of him scaring the vet). I go through this every year with one vet or another. I finally found a vet who took the time to get to know him, which helped, but then we moved to another town.
I got this horse when he was three, and he has always been agressive in these areas. I have never condoned it, and it has not gotten any worse or better.
I am wondering if there is anyone who has run into a horse like this before, and if anything has helped. I am okay with dealing with my agressive horse; I know him, and I know how to handle him. What I worry about are the people who come to our property. I really do not want this horse to injure anyone. I have recently moved him to one of our pens set a little farther from the house area to discourage people approaching him, and I have put signs on his fence. I am wondering if there are any other safety precations that might help.