General questions that may or may not help pin down a cause/causes of his charging the fence. Based on your posts above, that behavior seems to be the primary roadblock to him being turned out, if he stops the barn manager may feel more comfortable about him.
If you can narrow down some specific situational causes, you might be able to make changes to reduce this behavior. [Of course you don’t have the answer every question, or any question. And of course you may prefer to keep you answers private anyway. ) ]
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When does he charge the fence?
** All day long? Only in specific moments? Is there a time of day pattern (only am or pm)?
** Only when he sees a horse? Does he ever charge when no horse is there?
** Every time he sees a horse? Or just sometimes when he sees a horse? Only certain horses and not other horses?
** Does he charge any other animals? Dog, maybe? People?
** How often is food involved? Does this only happen at feeding time, or if he has a fresh pile of hay, etc.?
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What is the effect of human activity on his fence charging, if any? Looking for a sort of trigger for charge-energy (since charging is work and requires some adrenaline).
** Does he charge more when several people are out messing with their horses? Does general activity tend to have him more stirred up?
** Does he charge more around certain people than others? Perhaps he never does it when the owner is around, but often does it when the barn manager is around, that kind of thing. This is really telling if he only charges if he can see certain humans, and doesn’t charge if he can’t see them – even if he isn’t charging in their direction specifically.
Etc. You can think of more situational conditions specific to his environment and routine.
Anyway. This kind of yes/no definition of the situations around the charging might help narrow down potential causes, or at least situations that may trigger charge-energy.
I know of a gelding who hammered the door of his stall with his front hooves — but the situation that he did it was very specific. If he can see a bucket of food, he lost it and sounded like he was tearing down the barn.
The problem is that one person in the barn was habitually leaving a food bucket sitting where he could see it, every day. She never twigged that this is the only time the gelding bangs the stall door. She thought the banging was just a random habit and yelled at him to stop, which had no effect.
I pointed out that he does not do this behavior at any other time. No bucket in sight, he’s quiet. That if she is not in the barn, he doesn’t do it, even at feeding time (of course she couldn’t know that). It’s very peaceful in the barn if she isn’t there. The rest of us milling around did not incite the gelding to hammer the stall door.
Also mentioned the concern that repeatedly pounding on sturdy wood can eventually lead to damage deep in the foot. He could even crack a bone (a friend’s horse did from habitually pawing at something hard).
Anyway. Just looking at the situation when the horse was hammering was a pretty easy solution-finder. Might help with the charging?