Some dogs just don't bark very much.  A dog that is determined to protect the house from squirrels, people walking by the front, the neighbor's dog, cats, etc. can be a real nuisance.  Dogs do take on more responsibility for protecting the pack as they mature.  A dog's personality is largely formed by 12 weeks, but is not mature until 3 years old.  Excessive barking can be a problem.  
The dogs see all the people and dogs in the household as a pack with each having their own rank in the pack and a top dog.  Life is much easier if the 2 legged pack members outrank the 4 legged ones.  You can learn to play the role of top dog by
Reading some books or going to a good obedience class. A good obedience class
Or book is about you being top dog, not about rewarding standard commands with
A treat. Start at 
http://www.dogsbestfriend.com/.