I agree with being cautious with puppies. However, you can only control so much. My dogs are all vaccinated and go all kinds of places with me. I honestly do not know the vaccination status of other dogs around us; our obedience school does not even require proof of vaccination. I raised 3 dogs from puppies and lived in an apartment complex at the time. While I tried my best to be careful with them, they used common areas to go potty with other dogs going through. No one ever got sick, and they're alive and well today.