She is on a dry lot (5ac) and gets two - three flakes of orchard grass hay and 1lb standlee alfalfa grass pellets just a carrier for vitamins (mvp). I test my hay every year and it's low sugar <10%. I ride 3 x week for about 1-2 hrs. And she always looks better after riding but if I skip a week she is back to being huge again. It's so bizarre. She gets dewormed and teeth done, chiro, psyllium pellets. I have had lots of horses and never had one this bad. She needs to lose probably 100lbs. I may change her vitamins hoping that will help. ??‍???? is there a supplement that helps or what can I do?