I have a 9 month old male Yorkie named Puppers and just got my little Lucy this past Monday. They are doing GREAT and Puppers plays very gentle with her.
I brought Puppers with me to meet Lucy when I picked her up that way it wasnt a shock to have her in the house all of the sudden. When we got home they played in the living room and have been great since!
Hope it all goes well with your little one and the new little girl.
-Cindie, Puppers & Lucy
www.myspace.com/puppersandlucy