I'd think you could just keep them penned up. Hunters can be crazy. I've heard of dun and buckskin horses being shot during deer season because they are the same color as a deer. Someone around here even shot some cattle before just cause they were big and colored like deer. Orange non-toxic paint may work also but I'm not sure. I knew of a person sadly who would just shoot it because it was a turkey no matter what if it was in the woods as it was free for the taking in their eyes.