Dog Vaccination Schedule: Timeline by Age, and When a Vet May Advise Skipping
Vaccines are among the highest-value things you will do for a dog — they prevent diseases that are often fatal, and in the case of rabies dangerous to people too. But "what shots does my dog need, and
Reading Time
📖 4 min read
Guide Type
📋 General
Last Updated
📅 Sep 9, 2026
Breed
🐶 All Pets
In This Guide
Overview
Vaccines are among the highest-value things you will do for a dog — they prevent diseases that are often fatal, and in the case of rabies dangerous to people too. But "what shots does my dog need, and when?" has a more nuanced answer than a fixed calendar. The 2022 AAHA Canine Vaccination Guidelines — the reference most US veterinarians follow — sort canine vaccines into two groups and stress that the exact protocol should be individualized to each dog.
Core vaccines are recommended for essentially every dog regardless of lifestyle: distemper, adenovirus (hepatitis), parvovirus, and rabies (rabies is also legally required in most places). Non-core vaccines — such as leptospirosis, Bordetella (kennel cough), Lyme, and canine influenza — are recommended only for some dogs, based on where you live, how your dog lives, and its risk of exposure. Your veterinarian decides which non-core vaccines make sense for your individual dog.
The single most important thing to understand: AAHA states the protocol "should always be individualized based on the patient's risk factors, life stage, and lifestyle." What follows describes the general principles the guidelines are built on — it is not a substitute for the plan your veterinarian sets for your specific dog and your location.
Health
The puppy series: why it is a series, not a single shot. Puppies are born with maternal antibodies from their mother that protect them early but also block vaccines from taking effect. Those antibodies fade at different times in different puppies and are usually gone by 12–14 weeks — but you cannot know the exact moment they clear in an individual puppy. Because of that uncertainty, AAHA recommends starting the primary series at 6–8 weeks and repeating every 2–4 weeks until the puppy is older than 16 weeks (some veterinarians extend to 18–20 weeks in areas of high distemper risk). The final dose after 16 weeks is the one that matters most; an earlier shot may have been neutralised by lingering maternal antibodies.
Boosters. After the puppy series, AAHA recommends a booster within one year, then core-vaccine boosters every three years — not annually, because core immunity is durable. Rabies boosters follow local law, which may specify a one- or three-year product. Some non-core vaccines (leptospirosis and Bordetella, for example) genuinely need more frequent boosting because their protection is shorter-lived.
Titers — an option to discuss. For the core viral vaccines, an antibody titre test can sometimes show that a dog is still protected, which some owners use to avoid unnecessary revaccination. Titres are a reasonable conversation to have with your veterinarian; they are not a replacement for rabies vaccination, which is a legal requirement regardless of titre result.
The bottom line: bring your dog's actual vaccination history to your veterinarian and let them build the plan. Lifestyle (boarding, daycare, hiking, travel), local disease risk, and your dog's age and health all change what is appropriate — which is exactly why AAHA frames its guidance as a range of options rather than a fixed timetable.
Frequently Asked Questions
What vaccines does my dog actually need?
Every dog should have the core vaccines — distemper, adenovirus, parvovirus and rabies — unless there is a specific medical reason not to. Beyond those, non-core vaccines (leptospirosis, Bordetella/kennel cough, Lyme, canine influenza) are recommended only for dogs whose lifestyle or location puts them at risk. Your veterinarian chooses the non-core set based on where you live and how your dog lives.
How often do adult dogs need boosters?
For the core vaccines, AAHA recommends a booster one year after the puppy series and then every three years — not every year. Rabies follows local law (a one- or three-year product). Some non-core vaccines do need annual boosting because their protection is shorter-lived, so an adult dog's schedule is a mix your vet sets, not a single interval.
Why does a puppy need so many shots?
Not because one dose is too weak, but because maternal antibodies can block the vaccine and fade at an unpredictable age. Repeating the series every 2–4 weeks until after 16 weeks makes sure at least one dose lands after those maternal antibodies are gone. The post-16-week dose is the critical one.
Are annual vaccines necessary?
For core vaccines, no — the guideline interval is every three years after the first-year booster. But that is not a reason to skip the annual veterinary exam, which catches far more than vaccine timing, and some non-core vaccines genuinely are annual. Let your veterinarian, not a fixed calendar, decide what your individual dog needs each year.
Sources
This guide draws on the following published references. Each opens in a new tab so you can check it against what you have read here.
American Animal Hospital Association (AAHA)
2022 AAHA Canine Vaccination Guidelines(opens in a new tab)World Small Animal Veterinary Association (WSAVA)
Vaccination Guidelines (2024 Guidelines for the Vaccination of Dogs and Cats)(opens in a new tab)VCA Animal Hospitals
Vaccines for Dogs(opens in a new tab)PetMD
Puppy and Dog Vaccinations: A Schedule for Every Life Stage(opens in a new tab)
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