Puppy Vaccination Schedule: Core vs. Non-Core Vaccines and Typical Timing

Most puppies receive a series of core combination vaccines every 2 to 4 weeks, starting at about 6 to 8 weeks of age and finishing at around 16 weeks, followed by a booster within a year. Rabies is given at the age set by local law, usually after 12 weeks in the US. Non-core vaccines, such as kennel cough or Lyme disease, depend on where your puppy lives and what it does.

Your veterinarian sets the exact schedule for your puppy, so treat the timings below as a guide to what to expect, not instructions.

Why puppies need a series of shots

Puppies get some temporary protection from their mother’s antibodies. Those antibodies fade at an unpredictable age, and while they are present they can block a vaccine from working. Giving several doses a few weeks apart, ending at around 16 weeks, makes it more likely that at least one dose “takes” once maternal protection has faded. That is why one puppy shot is not enough, and why finishing the series matters.

Core vaccines: recommended for every dog

Core vaccines protect against diseases that are widespread, serious or transmissible to people. In the US, the AAHA Canine Vaccination Guidelines list these as core:

• Distemper: a viral disease affecting the respiratory, digestive and nervous systems.
• Adenovirus (canine hepatitis): protection is usually given as adenovirus type 2 in a combination shot.
• Parvovirus: a highly contagious, often severe intestinal disease that is especially dangerous for puppies.
• Rabies: fatal and transmissible to people; required by law in most US states.
• Leptospirosis: a bacterial disease spread through the urine of infected animals, including wildlife. AAHA moved it to the core list in a 2024 update, reasoning that any dog that goes outdoors, in cities or the country, can be exposed.
• Parainfluenza is often included in the combination shot as an optional component.

The combination shot is often called DHPP, DAPP or DA2PP, sometimes with an “L” when leptospirosis is included.

Typical puppy vaccine timeline (US)

This table reflects the general pattern in the AAHA guidelines. Clinics vary in exactly which weeks they use.

If you adopt an older puppy or an adult dog with no known history, your vet will usually start a shorter initial series.

Non-core (lifestyle) vaccines

These are recommended based on risk. Your vet will ask about your area, travel, boarding, dog parks, daycare and hiking.

• Bordetella and canine parainfluenza (part of the “kennel cough” complex): often required by boarding kennels, groomers and daycares.
• Canine influenza: for dogs that mix with many other dogs, or where outbreaks have occurred.
• Lyme disease: considered in areas where the ticks that spread it are common, alongside tick prevention.

If you live in the UK

UK practice differs slightly. The PDSA lists distemper, parvovirus, infectious hepatitis and leptospirosis as vaccines all UK dogs should have, with puppies usually starting at around 6 to 8 weeks and receiving two injections 2 to 4 weeks apart. Rabies vaccination is not routine in the UK and is mainly needed for travel. Kennel cough vaccination depends on lifestyle.

Keeping your puppy safe before the series is done

Until your vet says your puppy is fully protected, avoid places where unknown dogs gather and parvovirus may linger, such as dog parks, pet store floors and busy sidewalks. Socialization still matters a great deal in the early weeks, so ask your vet about safer options: carrying your puppy to see the world, visits with healthy, vaccinated dogs you know, and puppy classes that require vaccination records. Our guide to socializing a puppy has ideas, and the first week with a new puppy checklist covers the first vet visit.

Side effects and when to call the vet

Mild, short-lived tiredness, a slightly sore injection site or a small lump are common after vaccination. Call your vet right away, or go to an emergency clinic, if your puppy has:

• Facial swelling, hives or itching
• Repeated vomiting or diarrhea
• Difficulty breathing
• Collapse or extreme weakness
• A lump that keeps growing or lasts more than a few weeks

Questions to ask at each vet visit

1. Which vaccines is my puppy getting today, and what do they protect against?
2. When is the next dose due?
3. Which lifestyle vaccines make sense where we live?
4. When can my puppy safely go to parks, classes or daycare?
5. When should we start parasite prevention?

Keep the vaccination record somewhere safe; boarding, daycare, training classes and travel all require it.

Bottom line

Puppies need several rounds of core vaccines a few weeks apart, usually ending at around 16 weeks, plus rabies on the schedule your local law sets and a booster within a year. Lifestyle vaccines depend on risk. Your vet will tailor the plan, so book the first visit soon after your puppy comes home.

FAQ

How many shots does a puppy need?

Typically at least three core combination doses between about 6 and 16 weeks, plus rabies and, in many cases, two leptospirosis doses. Your vet may adjust this for your puppy.

What happens if my puppy misses a booster?

Call your vet. A short delay is usually managed by giving the next dose as soon as possible, but longer gaps may mean restarting part of the series.

When can my puppy go outside?

Your own yard is usually fine if it is not used by unknown dogs. For public places, ask your vet; many recommend waiting until about a week or two after the final puppy dose.

Do adult dogs need yearly shots?

Not every vaccine is yearly. Some core vaccines can be given every few years after the first booster, while leptospirosis and some lifestyle vaccines are typically yearly. Your vet will set the schedule.