He looked very bad last week, it seems to me like he's maybe filling out a bit, or maybe he just feels better. Last week his coat was very dull and flat, it should be noted that Phoenix was an easy keeper, he was fat; over the last few years he's been dieting and losing weight with exercise, he was a blimp only 2 years ago.
I think the fact that he looks so skinny now just freaks me out, plus he did drop a lot of weight with his illness, he still had a cresty neck and fat on his butt which is completely gone now. He went from a horse that was just touching his weight loss goal to a skinny awful looking horse in less than a month. Put it this way, he lost so much muscle/weight from his back that his saddle doesn't fit at all now.
I can't decide what type of hay he's fed, I also can't provide hay myself for him. (barn rules)