Sticky situation.

[newracer]

You completed your deal with party b. They made a deal with party c. You have no reason to be involved.

This

[Ridge]

But I do. I have to sign over the horse. I would like to sign it over to party B and let them handle the rest, but I can not as they are out of state, and not scheduled to return until September.

In that case, your legal obligation still remains with Party B. If you need to reclaim what is still your property to ensure they receive it, then so be the case.

[ronaldrwl]

I'm not a lawyer. It seems to me, the safest move for you is to give the property to whom you initially made the agreement with. I can't believe it's your responsibility to resolve the legal issues that may have come about. That's up to the courts.