Sadly, even if you had a written contract for a breeding loan, and you had to travel to another State to get satisfaction from the courts, and then either pay a lawyer or settle for a limited judgment from a small claims court, which would then be up to you to collect through a writ of garnishment or some other method, it likely wouldn't be worth the effort.
If he's in the area, I would be inclined to offer Wes a percentage to collect the debt.