16 year old PJ has always been healthy-- can still jump from the floor to the counter when he wants to. Today he got up and didn't want to eat and he hid in a clost. My husband took him to the vet at noon and he had labs, urine, everything checked and everything was fine. Gave him fluids. Came home and he wouldn't get out of the carrier. My husband finally dumped him out, wouldn't eat and went back in the closet. He never does that--he always sleeps on a cat bed on our porch (looking out over the back yard) or with a dog. Still hasn't eaten. Any ideas?