I'm not going to bother reading all of this, but it does sound as if these pups are at VERY high risk of contracting parvo regardless of them having a shot 'now'. We didn't even walk our last pup Spencer (who's almost 2) anywhere there was a risk of him walking where unknown dogs had been. The only place he was allowed was our backyard where we were 99% certain there was no risk to his health and well being. He was carried if he left the yard until he had his second shot, and that was followed up by a third vaccination before he was allowed any place other dogs went! I feel terribly sorry for these innocent lives that you've brought in within hours of losing a dog to parvo.