It sounds like you just put the cats together without properly introducing them. Cats are very territorial, so the residents view the new one as an intruder, and the new girl is just plain overwhelmed. New home, cats, people, etc. That's alot to take in at once.
You should put the new cat in her own room with all her supplies. Make sure it's a room with a solid door (not glass) so the cats can't see each other. Then you can start working on the intro process. If you Google "new cat introductions" you will find info on how to bring a new cat into a household with resident cats.
Speaking from experience, it is important to get your cats off to a good start, or you could be dealing with the cats not getting along for a long time. Be patient and don't try to rush it.
I don't have any advice for you on the dogs. Hopefully, someone else here can answer that. You can also try doing a search of the forum or the internet for more info on the dog-cat question.
Good luck and keep us posted!
Owned by Pepper and Pumpkin RIP Snickers 8/22/00 -- 11/28/06
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