Mystery Horse

Looking up horse words for the  #yearoftheHorse I came across this word along with a brief but strange description but it was some kind of equinid described as a zebra with a red man and golden yellow eyes. A horse marked with a pattern?

The only explanation I can think of is a perhaps some kind of  rare now extinct breed of wild donkey or onager the large variety with stripes perhaps that extended up into its mane?

Every character has a story but this story seems to have been lost?

Anyone know more?