I have done some research on the vaccines and that is why I was against lepto and the corona,also waiting till the puppy is a little older to vaccinate the experts go back and forth on the best time to start vaccines between 8-12wks but they all agree 6wks is too young because of the moms protection still being active in their systems could cancel each other out.AND really without a tieter test we don't know exactly how long each individual pup is protected.
