dirty gray horses

[esppatty@juno.com (Patty Lambert)]

I just had a thought - maybe it's way off base, but reading about this
gray horse who is always dirtying himself, I remembered I once had an all
black horse who was the dirtiest I've ever seen & now have a spotted
horse who is very clean. Could the rolling in dirt have something to do
with the horse wanting to camouflage itself? Like maybe this goes way
back to his "caveman" ancestors?? 

Patty Lambert