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!!