I have sold 2 horses with “trial periods”…typically lasting 1 week.
Horse #1, I trailered to my instructor’s place for a lesson. Her property was under contract for sale. The buyer, a H/J trainer admired my horse, and my trainer said “He’s for sale.” So we all talked and I left him at her place for the week for him and his students to ride. Of course, I knew my instructor was on the property and would take care of the hors. She had not yet moved. The horse sold.
Horse #2, I trailered for a clinic with one of the Cadre Noir instructors I speak of. Someone commented how much they liked my horse. I say, “He’s for sale.” It seems word got around the clinic auditors, because shortly I had someone who was interested in him come up to me. The clinic organizer and owner of the farm was well known and respected by me, so we agreed that the horse would stay at her place for the week. That horse returned home, but was eventually sold to another person who observed the horse while it was under the “trial” period.
Personally, contracts are great…but I prefer to “vet” the people. Legally enforcing a breach of contract is a very expensive undertaking. One that I prefer to avoid, by negotiating with reputable people. Contracts are only as good as the people signing them.
In both my cases, there was a third-party that I trusted in the middle that had care, custody and control of my horse. I did not just turn over the horse to the prospective buyer. I don’t know that I would turn over a horse to a buyer.