I'm not sure if APHA accepts Thoroughbred dams or sires, but they used to. My paint had all kinds of Thoroughbred bloodlines, but they were from generations past. In the case that they DO accept them, your horse could be a registered paint. Otherwise, no dice.
If he/she is colored like a paint, you can register him/her as a Pinto. They'll take anything with color.
But if you're looking for something to write down on paper, I'd go with "Thoroughbred/Paint cross," honestly =)
Appendix.
When you cross a quarter horse and a thoroughbred, you will get an appendix quarter horse. The paint may or may not come out in the foal. That is all in the genetics, and I would need more info to tell you that.
A Thoroughbred is a registered breed, while a Thoroughbred X (literally 'Thoroughbred cross') is a mixed breed with Thoroughbred blood present.
This depends on what you mean by Thoroughbred Paint. Thoroughbreds and Paints are two separate breeds. You can however have Thoroughbreds with pinto markings, but they are not Paints. You can also have Paint horses registered as appendix if they have one Thoroughbred parent.
If registered yes, a TB/QH cross is called an Appendix Quarter Horse. They have their own association.
Quarter horse, thoroughbred, arabian, paint
I don't think color matters but you generally don't' find paint thoroughbreds.
My favorites would be Paint, Thoroughbred, Arabian, Lizzipanner, or a mustang.
I don't think it is.
You will not see a Paint horse in the Kentucky Derby. The Derby is for Thoroughbreds only. A Paint is a spotted horse with Quarter Horse and Thoroughbred bloodlines.
I actually made up this breed. It is a cross between a Thoroughbred and a Quarter Horse.
my warmblood/thoroughbred cross when he thinks a plastic bag is chasing him :-O