I DEFINITELY say MALES...I have one of each. I don't know about you all, but my dogs act like children! They are both about 2 years old. My female has mood swings...she is happy one second,and mad the next. She pouts when she is scolded, and gets over it only when you apologize to her and over indulge her with affection. Spoilt dog huh? My male is so carefree. He knows when to stear clear of his grumpy sister, and how to push her buttons...typical male! He is so straight forward!