Parvovirus: Due Diligence and Why a Series Is Required

by Laura Kathryn, September 26, 2026

Due Diligence Until the Vaccine Series Is Complete: 6 . 9 . 12 . 16 weeks

Until your puppy has completed the full puppy vaccination series and your veterinarian considers them adequately protected, you must be diligent about where your puppy goes and what they are exposed to.

Avoid high-risk public areas, dogs with unknown vaccination histories, and places heavily traveled by dogs or wildlife. Parvovirus can survive in the environment and can be carried on contaminated shoes, clothing, hands, grass, soil and other surfaces.

When visiting your veterinarian, carry your puppy or keep them in a clean carrier rather than allowing them to walk on the clinic floor.

Why a Series of Vaccinations Is Required

Puppies receive temporary protection from their mother, but those maternal antibodies wear off at a different time for every puppy.

As those antibodies decline, they may become too low to fully protect the puppy from Parvo while still being high enough to interfere with a vaccine.

Because we cannot know exactly when each puppy’s maternal antibodies will stop interfering with vaccination, puppies receive vaccines at several ages.

Your puppy received their first vaccination at 6 weeks from Strauss and Solace. Their 6 week vaccination was a 5-way combination vaccine, providing protection against Canine Distemper, Adenovirus Types 1 & 2, Parainfluenza and Parvovirus.

Their subsequent booster vaccines should occur at approximately:

9 weeks
12 weeks
16 weeks.

The series continues through at least 16 weeks of age because maternal antibodies may still interfere with vaccination until that age in some puppies.

Until the series is complete, assume your puppy may still be vulnerable to Parvovirus.

Avoid High-Risk Exposure

Until your puppy is adequately protected, avoid:

• Dog parks

• Pet-store floors

• Veterinary clinic floors

• Public dog-relief areas

• Heavily traveled public grassy areas

• Hiking trails or other areas heavily used by dogs or wildlife

• Contact with dogs whose vaccination history is unknown

When in public, carry your puppy or use a clean carrier whenever practical.

Safe Socialization Is Still Important

Parvo prevention does not mean completely isolating your puppy.

Safe socialization can include:

• Healthy, fully vaccinated dogs that you know

• Private homes and private fenced yards

• Different people

• Car rides

• Grooming and handling

• New sights, sounds and experiences while being carried

Most Important

• Protection depends on completing the full puppy vaccination series — 6 • 9 • 12 • 16 weeks.

• Complete every booster vaccination recommended by your veterinarian through at least 16 weeks of age.

• Avoid high-risk environments until your puppy is adequately protected.