PS, If you your horse tries to really nip you, I wouln't TAP him on the face. I'd go momentarily ballistic. I will NOT tolerate biting. I would smack him on the nose or whereeve, I am not choosey and make a bit noise and wave your arms and make him think he's going to die, for aobut 3 seconds then stop. Do nothing. Let him soak on it and go right back to what you were doing.