How the schedule is built
Puppies inherit some immunity from their mother, but it fades at an unpredictable rate between 6 and 16 weeks. That’s why the core combination vaccine (DA2PP) is given as a series — a dose every 3 to 4 weeks, ending at 16 weeks or later, so it lands reliably once maternal antibodies are gone. Rabies is added around 12 to 16 weeks. This calculator turns those week-windows into actual dates from your puppy’s birthday.
Core vs. lifestyle vaccines
Core vaccines — rabies and DA2PP — are recommended for every dog. Lifestyle(non-core) vaccines like Bordetella (kennel cough), leptospirosis, Lyme, and canine influenza are added based on risk: boarding, daycare, hiking in tick country, or standing water nearby. Your vet tailors these to your dog, so they’re not part of the core schedule shown here.
Frequently asked questions
- When should a puppy get its first shots?
- Puppies usually start the core combination vaccine (DA2PP — distemper, adenovirus, parvovirus, parainfluenza) at 6 to 8 weeks of age, then get a booster every 3 to 4 weeks until at least 16 weeks. Rabies is typically given around 12 to 16 weeks. This calculator shows those windows from your puppy’s date of birth.
- How many rounds of shots does a puppy need?
- Most puppies need three rounds of the core DA2PP vaccine, spaced 3 to 4 weeks apart, ending at 16 weeks or older, plus a rabies dose. The exact number depends on when they start and your vet’s protocol — a puppy that begins at 6 weeks may need four rounds, while one starting later may need fewer.
- How often do adult dogs need booster vaccines?
- Core vaccines (DA2PP and rabies) are boosted one year after the final puppy dose. After that, many adult dogs get core boosters every three years, though rabies schedules are set by local law and may be annual or triennial. Non-core “lifestyle” vaccines like Bordetella are often given yearly based on risk.
- What vaccines are considered core for dogs?
- Core vaccines — recommended for every dog regardless of lifestyle — are rabies and the DA2PP/DHPP combination (distemper, adenovirus/hepatitis, parvovirus, parainfluenza). Non-core vaccines such as Bordetella, leptospirosis, Lyme, and canine influenza are added based on your dog’s exposure risk, which you decide with your vet.
⚠️ A reminder aid, not medical advice or a prescription. Vaccine products, intervals, and legal requirements — especially for rabies — differ by region and by your dog’s health. Your veterinarian sets the plan that’s right for your dog and where you live.