female cat attacking another female cat

Question
I have three female cats. I just got one of my cats back from a friend. She lived there for about a year. These cats all lived together previously just fine. Since I have brought Mattie back my Calico has attacked her three times. She also hisses at my other cat all the time but has never attacked her. Is there anything that can be done with her to make her stop. Would spaying help or not? Please help.

Answer
Karen,

I'm very sorry I didn't answer your question earlier but the hard drive in my computer died and I was just able to get it replaced.

Yes! Spaying will help. Spaying cures a LOT of behavior problems and helps settle the cats down where their minds aren't on tomcats and breeding.

Cats go by smell in recognition of other cats. Since your cat has been gone she has developed a different smell than when she was at your house, so to your other cats she is a new cat. You should go through the introduction process from the beginning just like she IS a new cat.

It can take 2 weeks, a month, or more for them to start getting along again. You can not just put them together and expect them to get along. That very rarely ever happens.

I am attaching a couple of links on how to go about the introduction process: (copy and paste, or type the whole links into your address bar)

http://www.messybeast.com/first-impressions.htm

http://www.littlebigcat.com/index.php?action=library&act=show&item=cattocatintro...

I hope this helps.
Tabbi