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Hello, Gary and welcome.
My name is ***** ***** I will be glad to help. I'm sorry you're experiencing this problem of aggression with Sara.
I will need a bit more information in order to best assist you.
How old are all the girls and who is the resident cat that Sara is bothering?
How did you first introduce them, when you brought home the two new kitties?
How long have you had the new furry girls?
Which plug-in and calming spray are you using?
Thanks for all your additional information and after you reply, please allow me some time to go through it and then, compose and send your detailed answer.