Good Luck !! I just rehome a yorkie, I got here at yt, First I was told she was 6 lbs, I said that good my miley is 8.0 lbs, and max is 7.0 so 6 will be good. I drove 6 hrs to pick her up and drive home . She is over 9.0 lbs and flights over everythings, does not share. My other two stick together all the time. I'm now in puppy class with her and she is doing better, but it's has been a fight all the way. So I feel for u, see if u can see a trainer in your area.
best of luck !
bark@ulater !!!
manina,miley
max
sasha