Instructions
Look at the back of the foal. A red dun foal will have a dorsal stripe, or a darker color of fur running along its backbone. A red dun foal's dorsal stripe should be a sharp-edged, red-on-red stripe of fur that runs all the way down to the tail. It may disappear or break up a little near the withers or hind hips of the foal and reform near the tail.
Inspect the front leg and hind legs of the foal for markings. The markings are a brindled stripe pattern similar to that of zebra stripes. They may be faint darker stripes of red or very light red.
Look at the foal's mane and tail. The mane of a red dun foal is a shocking darker colored red when compared to the rest of the foal's body coloring. Red dun foal tails will be the same color of its body, save for the darker center of the tail where the dorsal stripes meets it to make the hair red.
Inspect the chest of the foal for ventral stripes or barrings that are a different shade than the rest of the foal's body. The stripes or barrings may be subtle or they may stand out as a darker red-brown color.
How to Identify Red Dun Foals
Red dun foals are a type of newborn horse. Red dun foals are born yellow-red to peachy-red in a color that is called faded-out or light chestnut body. They have a red or dark red-brown back dorsal stripe, a dark stripe of fur that runs along the backbone of the foal. Red dun foals may also have faint striping in a dark red-brown on their legs. Dun is a color that was found in many early wild horse breeds. Dun is rarely found in horses that have been bred for show or racing and is a prized marking for horse breeders.