How Often Do Cats and Dogs Need Vaccines? Boosters Explained

How often do cats and dogs need vaccines?

It depends on the vaccine. Puppies and kittens need a series every 2–4 weeks, finishing at 16 weeks or older (WSAVA). For adults, US guidelines boost core vaccines every 3 years, while shorter-lasting vaccines such as leptospirosis are given yearly. Rabies follows local law and the vaccine label — yearly in some places, every 3 years in others. Follow your vet’s instructions for your pet’s schedule.

Typical intervalPer your vet · yearly to every 3 years

This guide is about keeping records and reminders only. How often, how much and for how long are decisions for your vet — always follow your vet’s instructions.

Different vaccines, different intervals

“How often” depends on which vaccine you mean — two shots given on the same day can have intervals that differ threefold. The World Small Animal Veterinary Association (WSAVA) splits vaccines into core vaccines, which every dog and cat should get, and others recommended according to lifestyle and location. Its 2024 guidelines say modern core vaccines protect for many years, so adult animals shouldn’t get them more often than necessary, while most non-core vaccines protect for about a year.

Type	Covers	Usual adult interval
Core vaccines for dogs	Distemper, adenovirus, parvovirus	One booster within a year of the puppy series, then every 3 years (AAHA)
Core vaccines for cats	Panleukopenia, herpesvirus, calicivirus (often given together as FVRCP)	Every 3 years (AAHA/AAFP)
Shorter-lasting vaccines	For example leptospirosis and canine influenza in dogs	Every year (AAHA)
Rabies	—	Set by local law and the vaccine label

WSAVA adds that where feline leukemia (FeLV) is common, kittens under a year old and adult cats with outdoor access should also be vaccinated against it.

Puppies and kittens: finish the series

Young animals need several doses, with the last one at 16 weeks or older. Antibodies from the mother interfere with early vaccines, so WSAVA recommends a dose every 2–4 weeks, with the final one at 16 weeks of age or later, and a booster at or after 26 weeks rather than waiting until 12–16 months. AAHA’s canine table calls for at least three doses between 6 and 16 weeks, and the AAHA/AAFP feline guidelines recommend a core booster at 6 months.

This is the busiest stretch of the schedule, so log each dose and the date of the next one as you go.

Rabies: the law sets the pace

Rabies vaccination is a legal requirement in many places, and the required interval varies. The US Centers for Disease Control and Prevention (CDC) tells veterinarians to vaccinate dogs, cats and ferrets according to local laws, noting that schedules vary by product and state, and that most shouldn’t be vaccinated before 12 weeks of age. Where local rules allow, the AAHA/AAFP feline guidelines recommend a 3-year interval using a vaccine labeled for 3 years. Other places are stricter: Taiwan, for example, requires dogs and cats to get a first dose at 3 months and a booster every year.

Even where it isn’t required, WSAVA considers rabies a core vaccine anywhere the disease is endemic. Ask your vet what applies where you live, and follow your vet’s instructions.

Why some vets still vaccinate every year

Yearly and every-three-years aren’t necessarily in conflict — it comes down to which vaccines and how much risk your pet faces. Some vaccines genuinely need annual boosters, and combination shots can bundle components with different durations. WSAVA also supports antibody (titer) testing to help set revaccination intervals for adult dogs and cats. Whether to boost every year, every few years, or test first is a decision for you and your vet.

Either way, WSAVA encourages a health check every year — it says the annual visit is much more than a vaccination appointment — and the AAHA/AAFP feline guidelines recommend reassessing each cat’s vaccine needs at that exam.

Common mistakes

Assuming adults are done for life. Core vaccines still need periodic boosters, and rabies follows the law.
Not finishing the puppy or kitten series. Stopping before 16 weeks can leave protection incomplete.
Logging “vaccinated” without saying which vaccine. Each one has its own interval, so you can’t work out the next due date.
Switching clinics without records. The new clinic won’t know what was given. Keep a photo of the vaccine certificate.
Remembering months late. If a booster is overdue, call your vet and get back on schedule.

How to remember

Track vaccines with different intervals separately — for example one item for rabies and one for core boosters — and ask for the next due date before you leave the clinic. With several pets, give each its own entries.

The yearly visit is a good time to bundle things: vaccines, a check-up, a review of your deworming and flea plan and, for dogs, the annual heartworm test.

Keep track of it with Againday

Vaccines come around once a year or once every few years, and each one runs on its own interval — exactly the kind of thing that’s easy to let slip.

Add a new item called “Rabies vaccine” and set How Often to “Your vet’s interval”.

Set How Often to match the schedule your vet gave you, not a number from this page.

Give it the tag “Pets” so you can filter it with related items.

Set its reminder time to 10:00 AM. You’ll get one notification on the day it’s due.

Put it in a shared list such as “Home”. Whoever does it marks it done, and everyone sees who did it.

When it’s done, tap the cycle ring to mark it done. Forgot to log it? Add a past date from the item’s page.

Add a note to each entry, for example: “Core booster given too; photo of the vaccine card saved”.

Againday is free for 3 items, with shared lists, widgets and reminders included. Againday Pro is one purchase, not a subscription.

Frequently asked questions

How often does a dog or cat need a rabies vaccine?

It depends on where you live and the vaccine used. The US CDC tells vets to vaccinate dogs, cats and ferrets according to local laws, and schedules vary by product and state; the AAHA/AAFP cat guidelines favor a 3-year vaccine where the law allows. Some places, such as Taiwan, require a booster every year.

Do adult cats need FVRCP every year?

Not necessarily. The 2020 AAHA/AAFP feline guidelines recommend boosting the core feline panleukopenia, herpesvirus and calicivirus vaccine every 3 years after the kitten series, while reassessing each cat’s risk at an annual exam. Your vet decides what your cat needs.

Do indoor cats need vaccines?

Yes. WSAVA says all cats and dogs should receive core vaccines; indoor cats usually need fewer of the optional, lifestyle-based ones. Whether rabies is required for an indoor cat depends on local law.

What if a booster is overdue?

Call your vet to get back on schedule rather than skipping it. AAHA’s canine guidelines tell vets to follow the manufacturer’s instructions for overdue vaccines, with the rule of thumb “when in doubt, vaccinate.”

Sources

Intervals vary by product, model and situation. When the manual or a professional says otherwise, follow them.

How often do cats and dogs need vaccines? Core shots, boosters and rabies