Many many years ago I had brought back two mares who were in worse shape than Honey.
It took TIME. It took a lot of patient riding at the walk at first, A LOT OF WALKING.
It took a lot of grain–oats, corn, and alfalfa pellets for the one I owned. The one I did not own, the barn owner upped her feed situation as the mare got better.
These were literally throw away horses who lucked out by ending up being owned by people who were willing to go out of their way to help them.
It took TIME. A LOT OF TIME.
IF I had tried to fatten up either mare in 90 days the mares would have foundered. If I had tried to feed either mare enough to build a “satisfactory” top line in 90 days the mares would have foundered (note that the blacksmith said Honey’s hooves showed signs of previous foundering.)
The improvements first show up in the horse’s eyes, at the point that the horse is convinced that she was not going to starve to death with the mare I owned. After the eye change it still took TIME. And the mares I had this experience with were Arabians, and I imagine it would have taken a lot more TIME to get an ASB with a decent coating on her ribs and more muscle on her back.
My fear is that the next person with this problem will read the whole thread here and end up foundering their poor horse because people on-line want instant changes, like overnight, presto, miracle, look what I did! type of thing.
It takes TIME to bring a horse back from near starvation, and lots and lots of good feed over MONTHS, many MONTHS, not just 90 days.