Anybody In the Retirement Farm business?

We are seriously thinking of a retirement home for horses. It will be a small operation, maybe five or six horses---we'll see how that goes
We have the time and the room and really would enjoy doing.

What I am wondering is how or what I could do to a owner who eventually doesn't pay for his retired horse (we know it is bound to happen). Let's face it, the retired horse is, basically, not one that I could re-sell to compensate for money owed. Just wondering if somebody out there is in this business, or knows of somebody, and how that situation is handled. I suppose I could put a lien on their first-born

Thanks---and as a 'newbie' here on the forum, I am reading like crazy all of the interesting posts!