Red Dun - dorsal stripe on a red dun horse. A red dun horse is a chestnut horse affected by the dun dilution. This dilution lightens the horse's body and gives it darker points and a dorsal stripe (a stripe down its back). Many duns also have shoulder stripes and zebra striping on their legs. A few also have cobwebbing on their foreheads, shadowing, and pale guard hairs.
Meet Chief: a Sulphur Spring stallion from Sulphur Springs, Utah. His herd lives at Return to Freedom and represents the influence of bloodlines that go back to the Spanish Sorraia horse and the Iberian peninsula in Spain.