Your horse has decent breeding.
GottaDunQH is right. But Appendix horses go a bit deeper than that, an Appendix horse has to win ROM points in AQHA shows or racing to have regular AQHA papers, it effects their offspring too. By Registry I have two Appendix horses, my gelding has one TB on the back of his papers my mare is half TB. Both carry Appendix QH papers. As for my mares build, she's 15.1 and looks just like a racey QH.
Running and hunter type quarter horses would be where the Appendix horses are. QH with lighter bone and build, suited for racing mainly or hunter under saddle horses.
Stock type quarter horses, the foundation breeding horses, generally shorter and heavier built. Think cutting and reining horses.
Halter types have big bodies with refined heads, generally tall with alot of body mass.
Quarter Horses vary is size and shape so much, we own seven and none of them carry the same build.
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