Apparently we have a LOT of canine behaviorist's responding to this thread

YES, there is a parvo vaccine. Puppies should be vaccinated with the distemper/parvo vaccine at 8 weeks, 11 weeks, 14 weeks, and finally 17 weeks for the final set and spay or neuter. If this set is not compleated, the animal is at risk for parvo and or distemper.

Animals that are NOT up to date on rabies vaccine and distemper parvo vaccine have NO business in a dog park...whatsoever.