I want to slim my Quarter horse down a little bit; he's not fat, but he could be trimmer. We have a pretty large pasture with only 3 horses on it, so I think this is to blame. Anyway, my options are either to put a grazing muzzle on him for most of the day, or to put him in a stall either during the night or during the day. Which would help him lose weight the quickest/be the best option?
BTW, he gets ridden 3-4 days a week.