jenluckenbach's advice is good. Let the cats get used to eachother's scent before introducing. Raven was our first pet in the house. We have had a total of 3 cats and 5 dogs brought into our home since we've had her. Plus we've babysat a few. Every single time, Raven gets mad at the world. But, I just give her space and time. She always seems to get over it.