Parvo is ugly, very ugly. It remains in wood, dirt, floors for years. Even then you can never be certain. We love German Shepherds and have lost one whole litter to the malady. Later, brought a new baby to live with us and it died of same. Have learned that older dogs (about 1-yr) have resistance. I don’t like older pups cuz I miss important bonding time that is never forgotten. Now we get a pup and basically have to imprison it for 8-12 months. It is no fun. Life lessons...