Originally Posted by mammakatja
I have a question and I don't mean to hijack but since we're talking about Appendixes, (which by the way is a perfectly legit term and I would continue to use it with your horse if he is indeed half quarter horse and half thoroughbred), but if a registered Appendix is crossed with a registered paint and the foal is born a solid color, do you now call the foal a paint or is it still considered appendix or does that term just apply to first generation crosses?
Just breeding a TB and a QH together doesn't make the horse an "appendix". That's a breed registry term, meaning when you register the offspring of a registered QH and a numbered/registered TB you get a horse that is registered as an appendix QH. If you breed that horse, I dont' believe you can register it QH unless it achieves QH status through a show record.
I don't know a ton about the paint registry, but I THINK as long as the horse is registered with the AQHA you can register it as a paint regardless of the appendix status but I'm not positive. The TB portion, not sure...