I have 3 spayed female dogs and they all get along great. I think it's more about individual personalities than what sex they are. Our little Biewer Yorkie Sprite is the baby at just over a year old, but she has a gentle personality and loves to snuggle with our cocker spaniel Sophie who has a similar way about her. Playtime on the other hand is all about racing around with Suki, our Yorkie/Maltese mix who is more energetic. We have never had any behavior issues or problems between our 3 females and they will all curl up together, groom each other etc. When we were looking at choosing our little Yorkie we were careful to try to select for personality first. I just love our little Sprite, and really whether you choose a male or female you can't go wrong if you try to choose a pup that has a complimentary temperament to your other dog
