We recently added a new little girl to our family. We've had Marty since he was 10 weeks old and now he's 2 1/2. Maddie, the new little girl, is four. There have been very few problems with the transition. The only time we have problems is when they are both trying to eat or when they both want a certain toy. Otherwise, they are both doing great! I think a lot of has to do with their personalities. I'm sure Butter would adjust just fine though.
