Which horse color has a mixture of white with black hairs over its body?

The correct answer is blue roan, which describes a horse color that features a mixture of white hairs interspersed with black hairs. This unique combination creates the characteristic bluish appearance that defines this color. In a blue roan, the base coat is usually black, and the white hairs blend throughout, resulting in a distinctive hue that can vary in intensity.

Understanding the other choices helps clarify why blue roan stands out; the Appaloosa is known for its distinctive coat patterns and spots, but does not fit the mixture of white and black hairs overall. Fleabitten gray refers to a gray coat with small reddish-brown spots, while a Paint horse typically has large patches of white and dark colors but does not specifically describe a blend of white and black hairs throughout the coat. Therefore, blue roan appropriately matches the description of a horse with a mixture of white and black hairs over its body.