Ellie May is right. At six weeks your puppy still had maternal antibodies from nursing which attack and kill the virus in the first vaccine leaving her unprotected. It's called the "window of susceptibility". That's why we always warn new puppy owners to wait until the full round of vaccines is finished (about four months) plus two weeks before bringing puppies to grooming salons, dog parks, public areas in apartment complexes and neighborhoods, etc. |