Brown 4

Perhaps it's time to give Zechariah's "brown" horse a rest!
But a bit of Googling reveals that, indeed, modern horse owners do not have "brown" horses:

A "bay" horse is reddish brown, especially with a black mane and tail.
A "sorrel" horse is brownish-orange or light brown.
A "chestnut" horse is dark golden brown or reddish brown.

So the next "brown" horse you see, impress its owner by using "bay," "sorrel," or "chestnut" correctly. And if possible, take a ride to find peace on earth (Zechariah 1:11).