Originally Posted by KGolden
My barn owners QH stud, Red, has them on his chest . All we know is that it's genes transferring from the TB horse Bend Or . Kinda cool though !
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It's not actually genetically related to Bend Or. He is just the one they are named after. Bend or spots can appear on any breed of horse, on pretty much any base colour. I have seen them be called grease spots, smut marks, and shadow spots.
As far as what is causing it, at the end of the day there is something genetic going on, probably something to do with sooty to be honest.