I know that when you breed two horses together, if it's say two Shetland Ponies that are both 10,8hh, that the height of the foal will drift towards the "average" height of the breed. Which for Shetlands is something like 12-13hh so the foal would be taller than both parents.
But is there like a minimum and maximum height for breeds? Some height that cannot be crossed however hard you try??