My puppies go out in my yard starting at about 3.5w old. Not for long, as they don't really like it until about 4.5w. Its the same germs in the yard, from the same dogs that are in the house. I don't take them places as they can get sick. I don't start vaccinations until 8w, as maternal antibody interference is too high. Puppies are for sure immune to parvo/distemper until their third set of shots at 16w. Before then its a crapshoot whether the other shots have given immunity.

As far as the conditions, well, I dunno. I am pretty pushy and would have told them what I needed them to do and expected them to do it.