Scaly, itchy patches with fur loss does sound a lot like ringworm. You should act on it quickly to keep it from spreading to everyone. I went through a bought of it when we brought Jazz home last Aug. and it took a good month of her in quarantine and medicine (both oral and topical) before it cleared up. That is one fungus I don't want to deal with again. Good luck. I'll be anxious to hear what you find out about it.