We just got a second Yorkie puppy a little over a week ago. It was a tough first week but things are getting better. My Rocky adjusted well to his new sister, better than we hoped. They run around and play a lot and seem to love each other. I had a rough first week but things are getting much better! It is nice to see them play with each other. Both still want attention from their people but they play with each other too. It depends on the socialization of both dogs, how they get along. We are lucky so far but I do look forward to when she grows up!