Does the mare discipline the foal? If so, to what degree?
My 16 yr old TWH has been with me since he was 2-1/2; he has always been a disrespectful snotface and got more "ccorrections" than all my Keeper horses put together.
I did eventually learn that he is oat/corn/soy intolerant and removing all that helped, but he can occasionally still be disrespectful not only to me but to his herd buddies, of whom he is third of four in the pecking order.
A breeder once suggested to me that he is that way because his dam probably didn't correct him when he needed it and let him get away with murder so-to-speak.
That is why I am asking what kind of disciplinarian the mare is.
I agree that handling the foal as soon as possible is important; my granddad raised Welsh/Morgans and my cousin's & my job was to "git to handlin' those foals afore they git to handlin' you". The fancy modern day word for that being "Imprint".
However, that is still no reason for the foal, as young as it is, to be so disrespectful and again, is why I ask what kind of mom the dam is