Okay so my gelding is 17, will be 18 in March. He's always been a harder keeper, especially over the winters. He seems to already be starting to lose weight, even though it's only gotten down to the 40's at night. He does get more ribby when ridden a lot, he's been ridden about 5x a week, but not hard at all. He gets a little over one scoop of senior feed twice a day along with beet pulp. Right now he has free choice hay and probably (hopefully) will continue to have that through the winter. Should I start blanketing him to keep him from burning calories to keep warm overnight? Or is there something else I could do?