I'm relieved to hear that he seems to be in good health other than his loss of appetite. Hopefully the blood work will tell you something and if it does I hope it's easy to treat.

Like I mentioned before, maybe he just doesn't like his old food any more. I used to feed most of my cats Wellness Core dry. Then for some odd reason my RB Storm, Ziggy, & Pearl refused to eat it. Only Sky would still eat it. I had to switch to a different grain free brand so now I feed everyone Merrick's Before Grain Chicken dry. I can now even feed Alani & Blaze this food and they have very sensitive tummies. It's also much less expensive. They didn't all like the Before Grain canned food though so I'm sticking with the Chicken & Turkey grain free Wellness canned. Here's a link to the Before Grain Chicken dry http://products.merrickpetcare.com/p...Cat/BG-Chicken and it also comes in Salmon & Tuna dry too.

Lots of prayers and positive thoughts are being sent Mac's way.