Complete Puppy Vaccination Schedule (With Timeline)

Why puppy shots are so confusing

Your puppy needs multiple rounds of vaccines, spaced a few weeks apart, with names that sound like alphabet soup. DHPP, DAPP, DA2PP. Depending on the vet, they might call the same shot different things. Then there are the optional ones that might not be optional depending on where you live.

It's a lot. And the stakes feel high, because they are. A large retrospective study notes that untreated canine parvovirus can have a fatality rate above 90%, while vaccination is central to prevention.

Here's the full timeline, broken down so you know exactly what your puppy needs and when.

Core vs non-core: what's the difference?

Not every puppy needs every vaccine. The AAHA canine vaccination guidelines split them into two groups:

Core vaccines are recommended for every dog regardless of lifestyle:

• DAPP or DHPP: distemper, adenovirus, parvovirus, and often parainfluenza. This is the combination vaccine your puppy gets in multiple rounds.
• Leptospirosis: a bacterial infection that can cause severe kidney or liver disease and can spread from animals to people. AAHA updated its guidance in 2024 to classify it as core for all dogs.
• Rabies: administered according to state and local law, usually beginning no earlier than 12 weeks.

Non-core vaccines depend on where you live and what your dog does:

• Bordetella: kennel cough. Needed if your puppy will be boarded, groomed, or in group training.
• Lyme: considered when a dog lives in or travels to areas with infected ticks. CAPC's canine prevalence maps and your veterinarian's local experience are better risk guides than human Lyme case counts.
• Canine influenza (H3N2/H3N8): often required by boarding facilities and daycares.

Your vet will recommend non-core vaccines based on your area and your puppy's exposure risk.

6 to 8 weeks: first round

Most puppies get their first shots before they come home, but verify this with your breeder or shelter. If they haven't started, your vet will begin at the first visit.

At this age:

• DAPP or DHPP #1 (core)
• Fecal test for parasites
• Some vets start Bordetella here if the puppy will be in group settings early

Maternal antibodies from nursing are still providing some protection at this age, which is actually why puppies need multiple rounds. Those antibodies can interfere with the vaccine's effectiveness, so a single shot isn't enough.

10 to 12 weeks: second round

This visit builds on the first round and introduces leptospirosis once your puppy is at least 12 weeks old, plus any non-core vaccines your vet recommends.

• DAPP or DHPP #2 (core)
• Leptospirosis #1 at 12 weeks or older (core)
• Bordetella if not started at 6 to 8 weeks
• Canine influenza #1 (if your puppy will be in daycare or boarding)

This is also the window where socialization matters most. The AVSAB puppy socialization position statement says owners do not need to wait until the vaccine series is complete before beginning carefully managed socialization. Use controlled environments and follow your veterinarian's advice about avoiding high-risk places such as dog parks.

14 to 16 weeks: the critical round

This is the critical end of the initial combination-vaccine series. AAHA recommends at least three DAPP or DHPP doses between 6 and 16 weeks, spaced 2 to 4 weeks apart. Your vet may adjust the final timing or add another dose based on the puppy's age and earlier records.

• DAPP or DHPP #3 (core)
• Rabies (core): one dose, timed according to local law and the product label
• Leptospirosis #2 (core): given 2 to 4 weeks after the first dose
• Lyme #1 (if recommended after a canine risk assessment)
• Canine influenza #2 (if started earlier)

After the rabies vaccine, your vet will give you a certificate. Keep it. You'll need it for licensing, boarding, grooming, and travel.

If Lyme vaccination is recommended, it requires two initial doses 2 to 4 weeks apart, so a second dose may fall after this visit. Ask your vet when each vaccine is expected to provide protection and when higher-risk public spaces are appropriate.

12 to 16 months: booster year

About a year after the puppy series, everything comes back around.

• DAPP or DHPP booster (core): subsequent boosters are generally given every three years
• Leptospirosis booster (core): repeated annually
• Rabies booster: timing depends on state law and whether the first dose was a 1-year or 3-year vaccine
• Bordetella booster (product- and risk-dependent)
• Lyme booster (annual, if applicable)
• Canine influenza booster (annual, if applicable)

After this round, your dog moves to an adult vaccination schedule. DAPP or DHPP generally shifts to a three-year interval, leptospirosis remains annual, rabies follows local law, and non-core intervals depend on the product and ongoing exposure risk.

The full schedule at a glance

Your vet may adjust timing based on your puppy's health, age at the first dose, product labels, local law, and risk factors. This schedule reflects the AAHA guidelines as updated in 2024 and is a starting point for most puppies in the US.

What if you missed a vaccine?

Life happens. Maybe you adopted a rescue with no records, or you got behind on a booster. Missing a date does not automatically mean restarting every vaccine. The catch-up plan depends on the antigen, the puppy's current age, the product used, and any documented doses.

For dogs older than 16 weeks with an unknown history, AAHA lists two DAPP or DHPP doses 2 to 4 weeks apart. Leptospirosis still requires two initial doses 2 to 4 weeks apart regardless of age, while overdue rabies vaccination follows local law.

Either way, call your vet rather than guessing. They deal with catch-up schedules all the time.

Keeping track without the spreadsheet

Between DHPP rounds, Bordetella boosters, and rabies certificates, there are a lot of dates to track. And the intervals aren't consistent. Some are 3 to 4 weeks apart, some are annual, some are every 3 years.

Pet Care Reminder makes this simple. Add your puppy's vaccination dates as you go, set reminders for upcoming boosters, and keep your records in one place. When your vet asks if your dog is up to date on leptospirosis, you'll actually know the answer.

Sources

1. 2022 AAHA Canine Vaccination Guidelines. Formal recommendations for core and non-core vaccines, timing, catch-up vaccination, and booster intervals; the guideline was updated in 2024.
2. A Decade of Treatment of Canine Parvovirus in an Animal Shelter: A Retrospective Study. Peer-reviewed evidence on untreated fatality risk and outcomes with treatment.
3. AVSAB Position Statement On Puppy Socialization. Formal guidance on beginning controlled socialization before the vaccine series is complete.
4. CAPC Parasite Prevalence Maps. Canine test-result data for Lyme, ehrlichiosis, and anaplasmosis used to support local risk assessment.