I have two horses, both super easy keepers (aka fat), my Fjord and my sister's Paint. The paint was just moved up here this week because of the drought where my sister lives and the mare has not been on grass for a couple of months. I am pulling them both off of pasture for at least 15 hours of the day since I am worried about her foundering. Should I be giving them hay in their stall as well as the grass they have been getting. I am not new to horses but am very new to their care since I boarded for years. Any advice would be much appreciated.