Two weeks ago I purchased two horses. The first one I brought home is a 15.3hh 4 year old thoroughbred from the humane society who is supposed to be from off the track but unraced. It turns out he has few ground manners and when he gets frustrated he often bites, rears up and strikes out or tries kicking. At other times he seems sweet and some what well behaved. A week later I brought home a 14.2hh 2 year old filly I'd put a down payment on a month before. She is well mannered and enjoys being around people. Since bringing her home the gelding has become very possessive of the filly and tries his best to keep her away from us and us away from both of them. When the filly does not do as he wants he will grab a mouth full of her mane/crest and bite. We just moved to the property and at this time we only have the one 3/4 acre corral so we can't separate them. We are working on refencing another 5 acres but it will be a few weeks yet. Does anyone have any suggestions on what I can do to stop this dangerous behavior? He is a beautiful horse and is still young so we don't want to return him to the shelter but nothing we try seems to work and I'd really hate for him to hurt the filly or one of us. Yesterday he had an issue with us even being in the corral with them. The only way I was able to back him off was to raise my hands over my head, yell at him and stomp/run towards him. Which scares the filly more then him.
The gelding has been gelded since a young colt.
I've been around horse most of my life and have broke and trained a few horses in the past but have never ran into an aggressive/possessive horse like him before.
When the horses are alone they get along great. Its just when a human gets near them that he starts getting aggressive with the filly.
I plan to send him to a trainer for an evaluation in two weeks after he/they settle in a little longer and have received all shots and have seen a farier.
I want to do most of the training but I need some suggestions to try to curb this behavior problem before it gets worse.
Any and all suggestions are welcome!!