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That horse has dapples due to the silver gene (Z in the gene test).

Sometimes genes cause them like how grey, champagne, and other light colored horses get them often, in this case it's silver and I've also noticed with my horses my black mare will get them during the summer when the grass comes in, and could possibly be because of the sun, my others (the bay and chestnut horses) will get them if on everyday grain and shed out I only have one bay mare who will get dapples on her butt no matter the situation