you have bonded to is the pits.

I thought Parvo vaccine shots were one of the first things that puppies were to receive. This is so preventable.
Yes it's one of the first shots, but protection is afforded only if a series of Parvo vaccinations are given. The problem is that the lingering maternal antibodies from the colostrum and milk can inactivate the attenuated virus in the vaccine, not allowing an immune response to occur in the puppy. This is highly dependent on age of the puppy. For example vaccinating puppies for Parvo at 4 weeks is next to worthless. If you combine that with a possible scenario where the follow up booster was of poor quality due to mishandling of the vaccine, it could occur that a puppy apparently immunized is not protected completely. Jezter apparently didn't have the classic signs of vomiting and bloody diarrhea (or no mention was made of it), so there might have been weak protection from prior vaccination.