My daughter's quarter horse is a dark dun color some say she is the brown shade of grulla. She is listed as bay on her papers, I never had her papers revised. One of my friends that raises buckskin QH's said alot of times these horses do look bay at birth and no one bothers to change the papers unless there is a dispute over a foal color. I love genetics and figuring color and patterns!
When our newest filly was born this year she looked like she might shed out grulla, but no she is a beautiful black and white tobiano. I like the duns and grullas in the mix to keep us guessing each year what the new babies will look like. Karen