I think USEF is the best way if they keep its name. They update points within a week or so of a show. If you know trainers name and the region they are in,you can look at Horseshowsonline and see results from each show. You can check results by trainer's name on that site.
I hope the horse has a happy, successful career in the US.
Some people are quite interested. I would LOVE to be in touch with my horse's breeder, but have no idea how to do that. Other people really do not care at all. Putting a note in the passport was a great idea.
It will be very difficult to keep tabs on the horse if the new owner changes the horse's name before it's registered with usef. Hopefully the horse has a 'cool' name that the new owner likes.
~ Citizens for a Kinder, Gentler COTH...our mantra: Be nice. ~