Re: Redirected/Territorial Aggression
Welcome to you both, and I am sorry liljen hasn't received any replies. I am not the best person to answer these questions because I haven't really had to deal with this. I have a multi-cat (usually always more than 4) household that has been up to a dozen at times, and sometimes higher if I was fostering a litter of kittens. I think because I have always had a lot of cats, and I keep new ones seperated for quite a while, the smells begin to all be the same and it isn't as traumatic when I finally allow the newcomer out to interact with my large group.
I wish someone else with more experience in this area would chime in to help. I am not sure I am really qualified to help in this situation, since I haven't experienced it.
Here is what I do to introduce new cats/kittens:
They are always kept in my Master Bath. During the day they are allowed into the Master bedroom while my established group of cats have the rest of the house. They are allowed to sniff/footsie under the door. When interest is shown on both sides, I will open the door a crack to allow sniffing and more footsie-ing. As that progresses nicely, I will hold open the door a littler further to allow for more sniffing and eyes to be able to visually see the other cats. I fist my hand at the edge of the door and prop my knuckles on the door jamb to hold it firm so there can be no 'escaping/intrusion' from either side. If that goes well, and cats are begining to be bored with the process and lose interest, then I will start to allow a few of the friendlier cats into the bedroom to interact (supervised) with the new kitties. After that has gone well, then I will progress to allowing them into the rest of the house.
Best of luck to you,