I'd suggest treating the situation as if you are introducing a new cat to the household. Keep them separated for a while and then slowly desensitize them to each other. There's some great advice on exactly this situation here: http://www.catsinternational.org/art...ther_cats.html
Good luck!
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"To close your eyes will not ease another's pain." ~ Chinese Proverb
“We must not refuse to see with our eyes what they must endure with their bodies.” ~ Gretchen Wyler
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