Our Standardbred, Twisted Mister, has one earlier AERC ride under a former owner and under a different name. I think it was Twister John, and without an AERC number. Now this is no big deal. It doesn't look like he really wants to be an endurance horse, but if he had been such an underwhelmed sort of horse or if he had done a lot of miles, I certainly would have wished that owner had used his registered name on her entry so that I could prove he'd gone the miles.
