He has always had free choice hay in the winter but since we have had literally no rain here, and therefore have no grass we left them on hay this year. He has always dropped weight a lot in the winter and usually puts it back on quite fast when it warms up. I show hunt seat, barrel race, and jump him which us why he gets worked so much. I cannot monitor his hay intake as he is in a pasture with other horses, and we have no where else to put him. As for saddles, I have been riding him in the same saddle for just shy of 5 years and have never had this happen before.. I will try to get a picture as soon as I can.