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BeefCake I have brought puppies home, over the years when I have (always) 3,4, or 5 grown dogs. I always tell them "be nice, it's a baby dog". I have never had a problem-only if they played too rough,then I tell them to take it easy.That's your baby sister. You have got to be sure that BeefCake is included in everything to do with the pup,and keep his regular routine. Don't scold him for taking something from the pup,or just make sure he is included as usual. It should be easier to potty train the pup because if you take them out together,the pup will usually pee if Beef pees, though the pup will have to go more often. If Beef is selfish with his toys keep an eye out, so he doesn't hurt the pup. Good Luck and congrats!