Thanks everyone.
I took him to a fifth vet who kept him for observation. They discovered he was dehydrated. I guess I didn't notice that when I put water out for him he wasn't drinking. They were able to get him to drink from a fountain. He said some dogs and cats won't drink from standing...
He currently gets Blue Buffalo Indoor Cat Formula (the kibble). My vet as well as the other two I've seen said it was fine. I haven't tried any kind of wet food yet.
Would the declaw still hurt? He doesn't mess with his paws at all and from what I understand it was done when he was very young -...
I would like to give as much information as possible. I recently aquired an 8 year old cat my parents could no longer care for. They had him declawed and nuetered. I had my vet look at him right away and since. Blood work is clean and shots are up to date. She thinks he is maybe a pound...