We survived introducing three cats
Hi,
We did the same as kitkat.
1. Kept them in separate quarters and let them sniff each other from under the door.
2. After a week, let them out and monitor their behaviour. If they sniff each other, it's a good sign. If violence occurs, go back to 1.
3. Make sure you pay more attention to your first cat, as he or she may feel very threatened.
4. When apart, give your new cat lots of love too, but not in view of your first cat.
I kept a log of how we introduced two new kittens to our only cat (who is now 12 years old) when the two babies were just 2.5 months. They're getting along okay, but at night I keep them separate to give the older boy some quiet time away from the boisterous kittens.
Feel free to visit their blog at
http://threecats.blogspot.com and head to the archives to start. I wrote since day one so it should be a fairly accurate account.
All the best, and thanks for giving a home to another cat!
Bests,
Three Cats' Mom