Heck, my oldest(shih tuz, just turned 11), loves the youngest one I just got back in November. I have 4 inside ones(2 outside) when I bring a new one home, I put them on the floor, let all of them smell the new one then let them play, why I sit there and watch. Mine have never fought, nor would they be allowed to fight. It's funny, but, dogs seem to know when you bring them home which ones are staying and which ones are just visiting. If she misses the little boy, and acts like she's lonely, then, def. get another one, if she acts content being an only child, sometimes it's better to leave it at that |