post some ads, say 'to good home only'
There are some horror stories, but usually you can tell what a buyer is like. When we were selling my horse payday, some eventers came to look at him and I did not like them as soon as I saw them. But then a girl and her mom came and we loved them, so he went to them. It was so comforting knowing he went to a loving home. Trust me, the right owners will find him, you will know them right away. You can also write a contract where they have to tell you if they are selling him, and just be straight out with them. Say. 'hey, I don't want to sell this horse, I love him, could I please come and visit him sometimes if I call you ahead of time? Just to visit?'. Most people would be fine with that. :)
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