I just got an email from a lady who described her 4 year old dog as a puppy, and she wondered if he was old enough to start coming to school because he was driving her crazy.  The problem is that her dog is not a puppy.  The term puppy is roughly equivalent to the human term infant or baby. 

With our new puppy program we have been hearing from more and more puppy owners and a surprising number of them are bring home their pups at six weeks of age, often without their first set of shots.  Puppies from pet stores may be older when you meet them, but may have been taken from mom as early as four weeks of age.