Which color is characterized by a mixture of white with red hairs?

The color known as Red Roan is characterized by a mixture of white hairs interspersed with red or chestnut hairs. This blending of colors creates a distinct appearance where the base color (red or chestnut) is softened by the white hairs, leading to a visually striking coat. Red Roans often exhibit a varying amount of red tint, depending on the concentration of red hairs present, while the white hairs are evenly spread throughout the coat. This color pattern is specifically defined and recognized in horse color classification, making it clear why Red Roan is the correct answer for this question.

In contrast, the other options represent different color patterns: Blue Roan typically features a mix of white and black hairs, Buckskin is characterized by a gold or tan body with a black mane and tail, and Grullo is defined as a diluted color that can give a mouse-gray appearance, often involving a black base and lightened mane and tail. Each of these options showcases distinct characteristics that do not align with the definition of a mixture of white and red hairs, further confirming the correctness of identifying Red Roan as the answer.