Hi – and thanks all for the good advice…
I did just that – the new cat stayed for 3 days closed in one room, and I showed her to the others while she was closed in a kitty-box.
I let her out from the room two days ago, and I think she thinks I’m hers – she tries to prevent my other cats to come close to me. A lot of hissing and spitting…
Anyway – I live in the country, and she discovered the kitty-door I have for the other cats, and she figured out really fast how to use it – I found her outside hunting…
I really hope all of them will eventually get along all right…
(I hope I’ll have the patience for that too )
Anyway – I’ll be happy to hear more ideas as how to reduce the tension between them.