I am partial, but Boxers are the best dog in the world for kids. They are also magnificent watchdogs. They are very intelligent and aware of everything going on around them. They are also extremely clean, they tend to clean themselves like cats. They have no odor at all.
No one, NO ONE comes into the yard or the front door without our Boxer knowing about it. They are friendly by nature, but are absolutely without fear when confronting a threat to their family. I've seen mine confronting what he thought was a threatening person in our home after midnight--very intimidating. The perfect dog, really.