What do you call horse who coat is brownish-gray?

Here's a breakdown:

* Bay: A horse with a brown body and a black mane and tail.

* Brown: A horse with a brown body and a brown mane and tail.

* Gray: A horse that is born a different color but turns gray as they age, with white hairs intermingling with their original coat color.

So, while "brownish-gray" might describe the color, the official term for this type of horse is bay.