Core and Non-Core Vaccines: What the 2024 WSAVA Guidelines Say
Which vaccines every dog needs, which depend on where you live, and why the global guidelines say core boosters aren't needed every year.
Written by thecanineledger
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The world’s largest association of small-animal vets publishes vaccination guidelines that are used across dozens of countries. Its 2024 edition contains two sentences that surprise many owners: “Vaccines should not be given needlessly. Core vaccines should not be given any more frequently than necessary in adult animals” (Squires et al., WSAVA Vaccination Guidelines Group, J Small Anim Pract 2024).
The same guidelines are just as firm the other way: “We should aim to vaccinate every dog and cat with the core vaccines.”
Both are true at once. While every dog needs a small set of vaccines and needs them on time, the most important ones protect for years, not months, and some others are only worth giving where the disease is a real risk. This page explains which are which, and why your dog’s schedule may not match your neighbour’s.
1. Core vaccines: the ones every dog needs
The WSAVA guidelines define core vaccines as “those that ALL dogs and cats should receive, after considering their lifestyle and the geographical locations where they live or to which they travel.”
For dogs, three are core everywhere in the world: the vaccines against canine distemper virus, canine adenovirus (which causes infectious hepatitis) and canine parvovirus. These are serious, often fatal diseases, and parvovirus in particular is still common. → Parvovirus: Survival, Hospital Care, and the Outpatient Option
Rabies is core wherever it is endemic. The guidelines say rabies vaccines “should be considered core in all countries or regions where the disease is endemic,” and go further: vaccination is essential in those places “even if there is no legal requirement for this.”
2. How long core vaccines last
This is where the guidelines and the “annual booster” habit part company. WSAVA says that “There is an abundance of peer-reviewed, published evidence showing that the duration of immunity (DOI) provided by most, modern, modified live virus (MLV) core vaccines is many years.” Modified live vaccines are the usual kind for distemper, adenovirus and parvovirus.
For adult dogs, the guidelines’ recommendation for these core vaccines is to “revaccinate at 3 years of age and thereafter no more frequently than every 3 years”.
That doesn’t mean your dog should only see the vet every three years. The guidelines are clear that the yearly visit matters, and they push vets away from calling it a “vaccination consultation”: “The annual health check is much more than just a vaccination consultation, although it will often include administration of selected vaccines that need to be administered annually.” → The Annual Check-up: What the Evidence Can and Can’t Say
Our note: “No more often than every three years” is our one-line summary of WSAVA’s adult core schedule. Product licences and national guidance may differ.
3. Puppies: why the last dose matters
A puppy is protected at first by antibodies from its mother. Those same antibodies can stop a vaccine from working, and nobody can tell from looking at a puppy when they will fade.
So WSAVA recommends “multiple core vaccine doses to puppies and kittens, every 2 to 4 weeks, with the final dose being delivered at 16 weeks of age or older.” It also suggests considering another dose at about six months, “rather than waiting until the dog is 12 to 16 months of age,” to narrow the gap for any puppy whose earlier doses didn’t take.
The point for owners: a puppy who finished their first course before 16 weeks may not be fully protected. Ask your vet when the final puppy dose is, and keep a young puppy away from places where unvaccinated dogs go until the vet says they’re covered.
If cost means a puppy can have only one vaccination, the guidelines say it should be given “at 16+ weeks of age.”
Our note: Early socialisation matters for behaviour. Ask your vet how to socialise your puppy safely before it is fully vaccinated.
4. Non-core vaccines: it depends on your dog
Non-core vaccines are, in WSAVA’s words, “those that should be highly recommended in animals whose geographical location and/or lifestyle (e.g. indoor-outdoor access, multi-pet household) places them at risk of contracting particular infections not designated as core.” In other words, whether your dog needs them depends on where you live and how your dog lives. Examples include vaccines against kennel cough and Lyme disease.
Leptospirosis is the one that varies most. It is a bacterial disease spread mainly through the urine of infected animals, and it can be passed to people. WSAVA says that where it is endemic, “vaccination of all dogs against leptospirosis is highly recommended and the vaccines should be considered core in those places.”
The American Animal Hospital Association (AAHA) goes further for North America: “All dogs in North America should be considered at risk of leptospirosis” (AAHA 2022 Canine Vaccination Guidelines). It adds that the old picture of a large rural dog no longer holds: “Small-breed dogs are frequently infected”.
Leptospirosis vaccines need boosting every year. Unlike the core viral vaccines, WSAVA says they “provide relatively short-term immunity, thought to be less than 18 months.”
A note on funding. The AAHA guidelines state that they “are generously supported by Boehringer Ingelheim Animal Health, Elanco Animal Health, Merck Animal Health and Zoetis Petcare,” all of which make animal vaccines. That doesn’t make the guidance wrong, and its leptospirosis advice is in line with WSAVA’s for areas where the disease is common. It is something readers should know.
Our note: AAHA calls leptospirosis core in North America, and WSAVA calls it core where the disease is common. Ask your vet which applies where you live.
5. Why your dog’s schedule might be different
Three things can change the schedule your vet recommends:
The law. Rabies vaccination rules are set by governments, and WSAVA is clear that “In countries where the legal requirement is at odds with the vaccine datasheet, the law must be followed.” Travel rules can also require it.
The product. Each vaccine is licensed for a stated duration. WSAVA notes that revaccination intervals for rabies “should be based primarily on local regulations and, in the absence of these, on datasheet DOI claims.”
Your dog. Lifestyle, health, medication and local disease all matter. That is a conversation, not a chart.
Titre testing, a blood test for antibodies against the core viruses, is another option some vets offer instead of a routine booster. It has its own limits. → Titre Testing Instead of Boosters: What It Can and Can’t Replace
Our note: The rabies and leptospirosis advice depends on your country.
6. What to ask your vet
- Which vaccines are core for my dog, here?
- Which non-core ones do you recommend, and why? What is the risk locally?
- When is my puppy’s final dose? Is it at 16 weeks or later?
- How often does each vaccine need repeating?
- What else is the yearly check-up for?
None of these questions is a challenge. They are the questions the guidelines expect vets and owners to discuss.
7. What we could not verify
| Commonly said | What we found |
|---|---|
| “Dogs need every vaccine every year” | Not according to WSAVA. Core viral vaccines: “no more frequently than every 3 years” in adults. Some non-core vaccines, including leptospirosis, are yearly. |
| “Indoor and small dogs don’t need leptospirosis vaccine” | AAHA disagrees for North America. “Small-breed dogs are frequently infected”. |
| “One puppy vaccine is enough” | Not usually. WSAVA recommends several doses, the last at 16 weeks or older. |
| “If boosters aren’t needed yearly, the yearly visit isn’t either” | WSAVA says the opposite. The annual health check “is much more than just a vaccination consultation.” |
| How many dogs are under-vaccinated or over-vaccinated | Not found. We didn’t find a reliable figure for any of our three countries. |
Sources
- Squires RA, Crawford C, Marcondes M, Whitley N. 2024 guidelines for the vaccination of dogs and cats, WSAVA Vaccination Guidelines Group (J Small Anim Pract 2024; free access; read)
- AAHA: 2022 AAHA Canine Vaccination Guidelines: Leptospirosis (J Am Anim Hosp Assoc 2022; supported by four vaccine manufacturers; read)
- AAHA: 2022 AAHA Canine Vaccination Guidelines (landing page, read for the funding statement)
Always confirm with your vet before acting on anything on this page.