I have been searching the internet for answers as my FurBee has alot of these same symptoms. We have done all the blood tests etc and come up normal. Two months ago this was a healthy, vital young cat, now he has lost alot of muscle tone, no appetite, just lays around. The vet is stumped.
I've tried everything I can think of. He's been on canned food with small amounts of dry food, now even raw food doesn't interest him. The vet put him on a course of prednisone but so far ( 2 days) there is no change. Things are looking grim for him and I am at my wits end. This is a cat who had a voracious appetite for food and life and to see him weak and lethargic is heartbreaking. I thank you for this forum as a place that I can spout off and get my concerns out in the open, I will keep you informed as to our outcome.