Has he ever seen a vet? It sounds to me like your neighbour next door is nice enough for you to go over again and ask what her plans are when she moves. If she tells you she can't take the cat, then tell her about the CAT'S LEAGUE and ask her to take him there. He needs a chance at a better life. Thats just sad that he has to live like that.

Do you belive that if she did take the cat with her, would she give him the care he needs? I just think that if she not caring for him now she wont later. He needs a better home it sounds like to me.