Oh okay, thanks. =] So oversize would be like a draft size? And fullsize would be horse-sized? I've just never seen it written like that before, I'm used to seeing weanling, yearling, cob, arab, horse, draft, pony, etc, lol.
And PS, you were right, I typed it wrong. It does say O/S and F/S on the website, I just got the letters mixed up. Either way, I didn't know what it meant, lol.