Final answer:
Puppies should be vaccinated for parvovirus every 3-4 weeks starting at 6-8 weeks old until they are 16 weeks old to ensure they develop proper immunity.
Step-by-step explanation:
In order to prevent parvovirus in new puppies, they should be vaccinated every 3-4 weeks starting at age 6-8 weeks until they reach 14-16 weeks old. To prevent parvovirus in puppies, it is crucial for them to get a series of vaccinations as part of their early life preventative healthcare. Puppies should be vaccinated every 3-4 weeks starting at the age of 6-8 weeks until they reach 16 weeks of age. This series helps to establish immunity by providing the vaccine at a time when the natural immunity from the mother's milk is starting to decrease, ensuring that puppies remain protected as they grow.