gosh I sure hope not. I went to the local shelter yesterday to license my puppy and of course I have to walk through and see the dogs, one of the pens had a huge sign that said "parvo has been detected in this pen, no dogs in here till further notice, to be bleached daily", I asked one of the workers, they said bleach is the only thing that will kill parvo and they keep all dogs out of that pen for months.