Yep, its called NATURAL IMMUNITY. Isn't the body a wonderful thing when left alone to do it's job 8)
I am starting to be proud here ;D ;D I spent my childhood around dirty animals, ate fruits from trees, did not wash my hands (don't tell my mom olice.
What I wonder about is if lets' say the bitch is vaccinated many times and in general her natural immunity is not the strongest. Then she has puppies... Do the puppies still get immunity from her or how does it work?