How is a Red Dun horse characterized?

A Red Dun horse is characterized primarily by its distinctive coat color, which is a yellow or gold base complemented by a red mane and tail. This coloration is a defining trait of the Red Dun variant and stems from the dilution gene acting on the chestnut base coat. The body being a yellow or gold hue with a red mane and tail is essential for identifying this particular type of horse.

Understanding the genetics and specifics of horse coat colors is crucial in differentiating types and recognizing the visual traits that signify each breed or color variant. The other choices reflect different aspects of coat coloration and breed standards that do not align with the unique characteristics of the Red Dun.