I agree safe is best , I am only saying what I do with my pups , some breeds are more prone to parvo , and being non responders .... I've never known a ddb with parvo , they may be naturally more resistant to it ..... rotts and pits are notoriously susceptible , for some reason some of them could have 4-5 parvo shots and still contract parvo ...... I do believe ,with my dogs , a parvo shot or any vaccine given after 12 weeks should be their last one ....... i'm sure most folks know once you get a response from a vaccination more doesn't make any difference ..... any more than the first one that elicits a response would be redundant ....... a vaccination given after 12 weeks in an immune normal dog has been shown to titer positive 100% after 10-14days ....... my dogs and pups are exposed to a lot of strange and stray dogs , along with wildlife , I personally do believe naturally acquired immunity is a result of healthy immune systems .......... not sure how common allergies are in ddb , but I've never had a dog with one . as far as I know I produced one dog with an allergy , that was in the days of giving 5 way and 7 way shots every few weeks ......