Jet is branded on his left hip. It's one of the ways that we know that he's from out West and a Mexican Mustang (aside from his training which is fantastic). It's more visible in the summer because of this shorter coat. It all but disappears in the winter. He was hot branded, probably many years ago (freeze brands would have left just white hairs instead of a burn mark). I have no idea what the brand is but it's unique.