so you called a vet in, but you still should have got your horse out sooner, as in BEFORE he got so ribby, wouldn't you sense something was up?
couldn't you tell?
couldn't the VET ?
and why did YOU clean his stall?
certainly you'd have noticed how bad it was getting, it didn't get to that point in a few days. I'm not trying to accuse you, I'm asking questions to get to the bottom of this.
Equestrianism; 10% luck, 20% skill, 15% concentrated power of will, 5% pleasure, 50% pain and 100% reason to remember you're absolutely insane to be riding a beast that big.