Diagnosing the Parvovirus?

I have 2, 12 week old, Husky pups. The male had very watery stool, sudden onset, and had no appetite, but drank water when needed. This sent me into great concern as I know that a clear watery stool is far from normal. I then took both off to the vet and it was said that they have the parvovirus. But this is the thing, they are both eating normally and are well hydrated (pink gums and well perfused) there's no blood signs in their stool. They are not vomiting, and they are both still very playful and active. Could they have been misdiagnosed? But keep in mind they have a bit of a runny tummy, they are currently receiving daily doses of antibiotics and immune booster shots. Help me clear my confusion please?