Poor horsey, I hope that the horse gets better soon. I can't really see what is wrong with it, all I can think of is that there is something making her/him not wanting to eat, maybe the horse is in pain somewhere, I don't know. I hope that vet can help

I will be praying for the horse to get better, I love horses so much and it is always such a sad thing when a horse had to be put to sleep, so lots of PT Prayers on the way