This worked for us... find one that is opposite personality. If one is dominant, choose a submissive... that way it eliminates both wanting to be dominant.
We also made sure to introduce all of ours on neutral ground. We stopped on the way home and took everyone (they were all adults) on a really long walk so they were completely exhausted. When we got home, everyone went in the house at the same time.
The next morning when everyone woke up, I think 2 of them were surprised to see the visitor hadn't left yet...but they were happy to see her too.
It took a few weeks for everyone to settle into their place but they have adjusted wonderfully.
I'm sure there are others that can offer what worked at their house too.
Good Luck and Congratulations on your pending addition.
