Puppy Vaccination Schedule: Week-by-Week Timeline

The puppy vaccination schedule confuses many new owners. Here is the straightforward timeline, why boosters are essential, and when your puppy is finally safe to explore the world.

Why So Many Shots?

Puppies receive maternal antibodies from their mother's milk, which protect them initially but also interfere with vaccines. These antibodies wane gradually and unpredictably — anywhere from 6 to 16 weeks. This is why a SERIES of boosters is needed. Each booster catches the window when maternal antibodies have dropped enough for the puppy's immune system to respond to the vaccine. A single shot at 8 weeks is NOT sufficient.

Core Vaccines (All Puppies Need These)

DHPP (Distemper, Hepatitis, Parvo, Parainfluenza)

Rabies

Non-Core Vaccines (Based on Lifestyle)

Bordetella (Kennel Cough)

Recommended for: dogs that board, attend daycare, go to dog parks, or visit groomers. As early as 6-8 weeks (intranasal). Annual booster. Note: protects against the most common cause but not all causes of kennel cough.

Leptospirosis

Recommended for: dogs with outdoor access, exposure to wildlife or livestock, or living in areas with standing water. Two doses 2-4 weeks apart, starting at 12 weeks. Annual booster. Increasingly common — many vets now recommend it for all dogs.

Canine Influenza

Recommended for: dogs in areas with reported outbreaks or that board frequently. Two doses 2-4 weeks apart, starting at 6-8 weeks. Annual booster.

Lyme Disease

Recommended for: dogs in tick-endemic areas (Northeast, Upper Midwest, Pacific Coast). Two doses 2-4 weeks apart, starting at 9-12 weeks. Annual booster. Year-round tick prevention is more important than the vaccine.

When Is My Puppy Safe?

Not until the FULL series is complete — after the 16-week DHPP booster. Until then: your yard and known vaccinated adult dogs are safe. Avoid dog parks, pet stores, sidewalks with high dog traffic, and areas where unknown dogs may have defecated. Parvovirus survives in soil for over a year.

The Booster at 1 Year Is Critical

Many owners skip the 1-year booster because their dog "already had all those shots." This booster is essential — it catches any dogs whose maternal antibodies interfered with the puppy series. Missing it leaves a window where your dog may not be protected.