Got Dawnie tested and just got the results from UC Davis via email:
Coat Color results for DAWN MCCUE(XXXXXXX):
N/O - One copy of the altered sequence detected. If bred to another N/O horse, there
Is a 25% chance of producing a lethal white overo foal. The N/O type has been
Detected in Paints (including breeding stock), Pintos, Thoroughbreds, Miniatures,
Quarter Horses and Tennessee Walking Horses.
Not a huge deal, just limits who I can breed too - pretty bummed.