I think dog shows are equivalent to day cares(human) as far as diseases go. My dogs have picked up stuff there A LOT. Horrid puking/diarrhea stuff. I do vaccinate occasionally for kennel cough, and mine have not gotten it even when dogs WITH kennel cough have drank from their buckets.

Since my dogs are adults, have healthy immune systems, and have had plenty of exposure, I do not worry about MINE. I go to the shelter and there is always parvo. I do not take precautions.

As far as dogs in my studio? Most are adults and I have a clientelle that is very conscientious. These are long term pampered pets. Its just not something I am overly concerned over
If I ever have a litter of puppies, I will not be going to shows, or going to the shelter(inside) for that time frame.