Linda Tellington-Jones has this theory that certain facial features (size of eyes/jowls/nostrils, shape of profiles, muzzle placement, length of mouth, shapes of ears, etc) can predict what kind of personality/intelligence that horse has. She has this chart with all these different facial features and everything. I laughed the first time I saw it and rolled my eyes. But honestly... the more I work with horses the more I definitely see some patterns emerging! I don't think I'm a true believer yet but I don't know! Large soft eyes mean sweet personality, high intelligence. The horses at our barn with large soft eyes have that. Horses with a large hard eye are intelligent but very dominent. Noticed that. Horses with a smaller "pig" eye are not as smart. I know some pig eyed horses that aren't so bright. Large jowls are a good sign. Etc etc. Anyways, I can't find the chart but you should do a little internet research, it's pretty interesting.