Newly neutered older feral in March was doing fine. two months ago, appetite decreased, excessive thirst and weight loss. Cat is soooo frail. I can't approach him yet. Still too feral but getting better. No chance of retrapping to go to the vet. He's wasting away. Any thoughts? The good news is that he's so happy now. Always close to the house and social with the other cats. Is content sleeping on my front porch all the time. Help!