Your mare would be eligible to register as Pinto (PtHA-- a registry that has been around since the 1930's)-- Pinto is a "limited" color registry-- they do have a few restrictions as far as type and breeds (no draft, no appaloosa, no grade stallions-- stallions are not eligible to be registered unless they have both parents registered with Pinto or an approved breed registry.)
The American Paint Horse Association has been around since the 1960s, and before that there were two other similar associations started with similar purposes (they merged in the 60's to form APHA). APHA has always had the stock type colored horse as a focus, and early-on they limited bloodlines-- for a t least 3 decades now they have had no provision for registering any grade horses on color, but require all APHA horses to be from registered APHA, AQHA, or Thoroughbred bloodlines. More recently they further restricted their breeding so that all horses must have one APHA registered parent to be eligible for APHA registration.
So based on the above, I would consider the APHA Paint to be a limited-book breed-- they accept 2 other related breeds for crossing, so there will be similarities in type to those breeds in some bloodlines.
PtHA Pinto I would consider a color registry limited to light/riding type horses and ponies from approved and/or known bloodlines. There is greater variety because they allow at least 19 approved breeds, and they do have divisions in their registry based on type.
Both registries also register solids from approved/registered parents, and allow them to show, but seperately from the fully registered horses that meet the color qualifications.
There are other paint/pinto registries out there, but the above two are by far the oldest, largest, and most widely recognized and "meaningful" (IMO) for paints/pintos.
There are many half-Arabian pintos dual-registered with PtHA, and their shows have show classes just for the Arab type-- its an option you might want to look into if there are PtHA shows in your area.
Cute mare BTW!
Last edited by Eastowest; 03-05-2010 at 10:55 AM.