okay- not to take away from the OP's original question- but about the sabino gene thing... I have had some people tell me at my barn Whiskey has minimal sabino markings on him. I just assumed he was sorrel with a pointed white sock and a blaze..
Can he have a sabino gene without being registered as a paint? He is AQHA Appendix registered. Haven't done a lot of sleuthing into the QH side of his breeding beyond on his papers, but if paint was in his history wouldnt his family tree had stayed paint? AQHA/APHA confuses me so sorry If I am not making a lot of sense haha