I've got two dogs who are chow chow mixes. One dog is a lab chow mix, adorable and as friendly as ever (also very protective of the house and the backyard, yet friendly as heck). One dog is a german shepherd chow mix, and she is so sweet and the best listener ever. None of these dogs have EVER showed aggression towards anyone.
We also have a german shepherd australian shepherd mix and he is the sweetest dog ever. He's a little over 14 1/2 now, but he still gives the most gentle kisses ever. And he is still VERY protective of the house and barks at anything LOL. When I was younger he saved me from a dog attacking me at the dog bark. He ran over before the dog got to me and fought the other dog.
We also had a doberman at one point. He died soon after I was born, but from the stories I was told, he was very protective of the family but a great family dog. Someone tried breaking into the townhouse one night and was trying to turn the door handle and he was barking mad which scared off who ever was trying to break in.
Actually, yesterday I was playing with a boxer. Boxers and pits are my favorite dogs of all time. This boxer was ADORABLE. Not mean at all in anyway, loved to play and was so sweet. I wish I could have him for myself LOL.
Soon, I hope, I will have a boxer or a pitbull. Everyone who says one breed is dangerous is lame, they just don't understand how the dogs really are.