We're going through bringing in a new boy home now.  We have an 8 yr old golden retriever Maggie female and an existing 4.8lbs male 7yr Rufus yorkie  that thought he was the king here.  Now we have 4mth old Riley male yorkie terror.  Lot's of fun going on in the house now with 3 dogs running arround.  Riley and Maggie get along just great they play tug of war and he follows her lead and chase's after her.  Rufus is another story right now he looks at this little guy as what did you bring him here for I was top dog.  Riley with non stop energy and play time while awake just seems to torment Rufus and Rufus sorta snorts at him and does his Elvis with the lip. All in all i see them starting to accept each other  and will some day be great friends when Riley learns that he can't jump and chase and steal anything he see's. Keep them separated when not supervised and  give it time.  Go for it if you can afford the time and the extra attention and of course the added vet bills.  But don't expect things to run smooth right off the start there will be a break in period for sure. Follow the protocol for introducing them to each other neutral territory.....Good luck and have fun with your boys.  Sorry long post Rufus made me write it
