Having a pup in the house requires a lot of special attention. Are you thinking of getting another pup because pups are cute and fun to have, or are you going to work with ALL your dogs to have them be the best that than can be?
Having more than 1 dog in the house is a lot of fun, but make sure that you are doing it for the right reasons!!!
If there was any concern in my house over dog agression or territory issues, I would wait untill I could work them out, or the situation changes so that I can handle more animals properly.
IMO (and you asked for it
) dogs should be brought into homes that are ready to do all the traning and work that are required to raise a pup to its full potential (and with a rotti, there is a lot of potential).
Good luck with your decision.