He's sabino based on the shape of his leg markings. It could be causing the tail too. I don't believe gulastra plumes are studied all that much because they're not very common.
Originally Posted by KyMoMoF3CuTiEs
I am no expert but, I have read that there is paint genes in quarter horses. That's how full blooded QH can have blue eyes and such.
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Saying "Paint genes" makes it sound like it is limited to Paint Horses. White or pinto patterns is more accurate because they are not limited to the Paint breed. Sabino, frame, and splash (the overo genes) all exist within Quarter Horses. The biggest one that does not is tobiano and never will. Appaloosa genes can also be found in specific Quarter Horse bloodlines.