Originally Posted by danicelia24
My husbands mare is a red dun and as far as I know neither of her parents were dun. But this filly gets a red dun vote from me!
Dun is a dominant gene, so it cannot be "carried" without being expressed. The most common way for dun to "appear" like this is that one of the parents is misregistered as a buckskin. Another way it can be almost hidden is if the dun carrying parent is a double dilute, or a palomino, which makes it harder to see the dun factor.