I’m sorry for your loss.
About six months ago, a horse tripped with me and took me to the ground with him. It was a very bad fall for me. We were cantering so there was a bit of momentum. I was lucky to have not broken my neck – despite having on a vest, I had very bad whiplash.
I could not ride that horse again. I spent a month trying to visualize it, but when I felt good enough to ride again, I could not get back on that horse. I did not want my trainer to ride it either. I did not feel right asking a friend to ride it. I had my vet examine him and she found nothing wrong with him. She concluded that “this horse knows where his feet are”.
In all likelihood, the horse fell because I was riding on a loose-ish rein and he was not paying attention. But in years and years of riding, and of having many horses trip, most recovered and I recovered and got our balance back without incident. But I shudder to think how many excellent riders have been harmed by a horse actually falling and taking the rider with them.
However, I could not see through advertising the horse for sale without also disclosing that he fell down. Nor did I want to ask my trainer to do so. There is a concept in law that considers the likelihood of risk against the gravity of harm. That fall was not likely to happen again, but that type of fall is so dangerous. I will add that the horse had a tripping issue. He was not lame, but every single ride, he would trip at the trot at least two or three times. He had never tripped at the canter, and on the day he fell, my mistake was thinking I would go ahead and canter and he would pay better attention to his feet.
After much consideration, I ended up giving him to a dressage trainer (with full disclosure), where he would be ridden in a much more managed manner. She is a careful person. She again had him examined and took some xrays. Nothing wrong. She put him into work at dressage, and sold him in-barn (with full disclosure) after 6 months with no incidents.
So that is onlyone story. However, the horse ended up with a good solution and no one personally involved with the fall was made to deal with the aftermath. I would talk to the trainer, get the horse a physical exam, and if the horse checks out, perhaps consider a new career for it as a dressage horse. Dressage is more managed and they more consistently ride the horse in more rein contact with more hind end engagement.
I would certainly talk to the trainer, and see if she has any suggestions. Even if she does not want to personally advertize him, she might have some suggestions about a solution for the horse.
I would also keep in mind, that from a trainer or owner’s perspective, if the horse were sold without disclosure, and another accident happened, IMO, the liability would be huge. In my case, six months later, I don’t think anyone is in danger, but six months ago, he could not simply be sold just like any other horse.