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Sorry for the delay in getting back to you. Things haven't really improved. I did separate them again. I've been using my dirty laundry to rub them both down, playing with each of them (separately) for long periods every day, and everything you suggested. The older female cat just will not accept the newer, younger male cat. She screeches, hisses, growls and tries to attack him if he happens to be in the same room she is in. They are no longer separated but usually someone is here to monitor them. I live in a small condo so it is really difficult to separate them. I was thinking of maybe doing it once a day -- maybe letting the older one have the run of the place in the morning and shutting the newer cat in the bedroom in the morning and then switching them later in the day. Although when I tried that before the older cat spent most of her time just meowing and clawing at the bedroom door, trying to get back in.
Thank you for your advice, Dr. Taus. I think that is all I can do. They are actually better than they were 10 months ago. It's a very slow process.