Just to go against the grain a bit here...
Just because you don't hear on the news that labradors attack people don't assume they don't ever. It's just not reported as they aren't seen as a threat to society, our children and the safety of the planet...
[/daily fail rant]
What I mean to say is dogs - any dog is capable or being aggressive if improperly handled.
As others have said, assuming the OP is getting a puppy, there is a heck of a lot of training and socialising to do in the first years of it's life (years not year - German Shepherds for example don't fully mature until they are three).
If the OP has young children and everyone will be out all day then I would suggest that isn't the ideal situation to be raising a dog in - in fact to be blunt, it would be damned unfair on the dog.
They have personalities and emotions, they will get bored, they will get lonely and they will pine when they are left alone.
If they get stressed (which leaving a new dog alone will cause) then they will start barking and howling which will drive the neighbours barmy and you may end up with problems from the council.
Don't think I am anti-dog - I think dogs are the best things on Earth, I have two German Shepherds, one from a pup, and one from a rescue. Before that I had a rescue GSD, and before that a rescue mongrel, I've been around dogs almost all my life and have seen loads of bad behaviour (rescue dogs are an emotional wreck for a long time after you first get them) and I wouldn't want it happening to the OP.
If you can't bring up a dog correctly from the off you are storing up trouble for the future and you can't do that if you are only with it - quality time wise - for three or four hours out of every twenty four. It's just not fair for the dog.
