Grade horses can be registered it says here :
545. If a Palomino horse is not eligible for registration with one of the recognized breed associations listed above, it may be considered for registration strictly on color characteristics for the body, skin, eyes, markings and mane and tail.
546. The ancestry or bloodline of these horses will not be shown on the registration certificate, unless it can be verified in fact. Methods of verifying facts should include, but not be limited to, breeder certificates, stallion breeding reports, and methods through genetic testing via PHBA recognized laboratories.
547. Its sire or dam is pinto or cremello or perlino may be registered. Pedigree on the certificate of registration will reflect only recognized breed associations sires and dams, if it can be verified in fact. Posted via Mobile Device