He is actually a large cat and was 19 pounds at one point not long ago, did not look very over weight. He is 10 pounds. Maybe less. He won’t eat again. The last pic was from 4 weeks ago. I guess the middle pic is most accurate. I can see his ribs. He’s so sad. He was always energetic. I’ll see the vet soon to try and figure out what to do. Any oral pill including apatite makes him worse.It's hard to tell by the pics how thin he really is. He actually doesn't look too skinny, but that could be just the angles. That is more a call on your part since you know what he looked like before. But, I am glad to hear he ate on his own!
Perhaps, the oral meds were just not agreeing with his digestive system and that combined with his lack of eating before he started the meds, it was just too much for him. With you keeping at it to ensure he was eating something, and the use of the transdermal meds at a lower dosage instead, perhaps he just needed some time to get 'back on track'.
Let's hope that is what it was, and that he continues to eat on his own!