I originally thought it was the CT water because Bailey has a sensitive stomach, so maybe her stomach wasn't used to out of state water. All states filter their water differently. My other dogs got sick about 4 days after Bailey. I didn't think it was a contagious virus. Otherwise, I wouldn't have allowed them to share the same water bowl. We original thought it was a bad reaction to the water or something Bailey ate in the park. She did pick up something towards the end of the picnic and when I opened her mouth, she already swallowed it.
Al my dogs are vaccinated against parvo. Unless, it is a new weaker strain, it's possible. They didn't need to be hospitalized for days on fluids, so it couldn't have been the normal parvo we are familiar with.