Roan (color)
Roan is a coat color found in many animals, notably horses, cattle and dogs. It is defined generally as an even mixture of white and pigmented hairs that does not "gray out" or fade as the animal ages. There are a variety of genetic conditions which produce the colors described as "roan" in various species.
Read more about Roan (color): Roan Horses, Roan Dogs, Roan Cattle, Roan Guinea Pigs