I have a male and my brother who lives next door has a female (which is my boxer's sister), and they get to play daily and love it. Mine is the outgoing one of the two, and his sister is the shy and quiet one. But when they get together everything works out, and both love each other to death. We've had no problems ever between the two, they never fight over food or toys or anything. It's a good combo. for us so far.