I've also worked on a horse that has super flaky dandruff especially on her back and sides of body. I don't notice it on her legs. I don't see her scratching herself. I find no sores or bumps or weeping on her skin. She's hardly ever bathed so it can't be too much bathing. She's outside all the time. The owner says she has always had a "bad complexion." She's a paint. I'm new to this so I don't know what to make of it, but there must be something to do to mitigate so much flaking. Does anyone have experience with this?