We bought our babies together (boy & girl) and our breeder told us that opposite sex babies tended to get along (bicker less) and babies from different litters bicker less. Not sure how 100% accurate her expertise is but I can say that after 7 yrs, our babies have NEVER had a fight. They absolutely love each other to pieces & while they did get into all kinds of mischief as puppies, we have not had the pack or training issues Ed mentions |