I’ve fortunately been able to keep track of all but one horse I’ve owned over the years. The first I sold to a Pony Clubber. Thought I’d found her a great home. A year later, a friend saw her at a dealer. Another friend, to whom I had offered her a year earlier had been unable financially to take her at that time, but was now in a better position, and she bought her and owned her until she was the victim of veterinary malpractice (and the vet paid up!).
Second horse, an unraced TB, JUST DIDN’T WANT TO JUMP. She’d happily jumped little crossbars as a greenie, but the minute it got serious, she wasn’t interested. A failing in a potential event horse. I sold her as a broodmare to a breeder who was producing purebred Arabs and Anglo-Arabians. She had a wonderful personality and nice conformation, so it was a good fit.
Third horse was my eventing schoolmaster. He develop glaucoma at age 17 and the rules then in place would not permit him being shown over fences thereafter. I found him a great home and when the people moved, they paid more to ship him to their new home than they paid me to buy him. When he had to be put down at age 25, they let me know.
The next horse I owned for 11 years and when he was 21 gave him to the friend who had re-purchased my first horse, and she had him until he died at age 27, happily trail riding him all over.
My next horse, of beloved memory, I owned for 20+ years. He was a saint. When he became too arthritic for anything but walking trail riding, that’s what I did for a couple of years. When I decided I HAD to have a younger horse, I bought a youngster, and while I waited for him to mature, searched for a lessor or half-lessor to trail ride the old fellow. Couldn’t find anyone, so I found a GOOD retirement place, but it was 90 mins. away from where I lived. Six months later, with youngster started under saddle, I was laid off. Aarrrgh. But you know, where there’s a will… between savings, temp jobs and unemployment, I supported BOTH horses until I found another full-time job. No lessons or training in that interval tho! A couple of years later, the old boy developed cancer and THAT decision had to be made.
All the above is not to pat myself on the back for doing the right thing, but to point out you have to work at it and to find good places for them, and if you can’t find such homes, they are YOUR responsibility. I can’t imagine thinking a Facebook giveaway was a good idea for a totally unusable horse.