I agree, and I think some criticism on my behalf is fair. I did respond uncharitably above, and that likely changed the tone of responses following.
To OP and the owner: Most of us on this forum are lifelong learners. In our pursuit of knowledge, we come to COTH from all walks of life with all kinds of perspectives. Thrilled to find likeminded people in a space that encourages free exchange of ideas and education, we often stay. Nowhere in the world is there such a concentration of decades of experience, knowledge, and insight of the horse world — and sometimes new folk can run afoul of this. Long time posters have generally seen it all, and when you’re here long enough it can be easy to not give new posters the benefit of the doubt. How many times has one of us spent a half hour of our time putting thought into a careful reply only to have it summarily dismissed?
The owner of this horse has gone beyond what most have, clearly - the horse has been seen by a vet with no answers. That’s very frustrating. I hope both the owner and OP understand the criticisms are not directed at them or their lack of trying (because clearly they’ve tried). Those of us that have been around horses long enough learn that every behavior has a reason and every misbehavior has a trigger. Some of us even have the unfortunate experience to learn that a stone we previously thought was already overturned and ruled out wasn’t ruled out at all - custom saddles that don’t fit, hooves with NPA or poor balance, a soft tissue injury that wouldn’t show up on X-ray for obvious reasons… Sometimes we can get so caught up in trying to fix the behavior we don’t take a step back and ask “why? Why is this behavior present and what am I doing that might facilitate it?”
I’m not saying that’s the case here, we have an owner that is clearly invested in answers. The BO has written a post from her own perspective with notes of frustration and the suggestion the horse is being uncharitable. That’s her perspective having lived it. Now, try to see it from the horse’s perspective.