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The core vaccines for cats protect against feline panleukopenia, feline herpesvirus, feline calicivirus and rabies, and the FeLV vaccine is core for kittens under one year old as well. The Cornell Feline Health Center says these core vaccines are recommended even for cats who never set a paw outside.
If your cat's whole world is a one-bedroom on the Danforth, that might feel like overkill. It isn't, and we'll get into why. We'll also cover each core vaccine, how a kitten series and adult boosters usually go, what Ontario law says about rabies, and what to ask at your next visit. Past the core, your vet builds the plan around your cat's age, health and actual day-to-day life, and your vet sets the schedule.
What does core mean for a cat vaccine?
A core vaccine is one recommended for every cat, whatever its lifestyle, because the disease it prevents is serious and widespread. The World Small Animal Veterinary Association (WSAVA) lists feline panleukopenia virus, feline calicivirus and feline herpesvirus as core for cats worldwide. Rabies is core wherever the disease is present, and FeLV is core for cats under one year and for outdoor cats in areas where it's common.
Everything else is non-core, which just means it's given based on risk. Your vet weighs those against where your cat goes and who they meet.
The core vaccines for cats, one by one
The core vaccines for cats come down to five diseases, and three of them share one shot.
| Vaccine | Disease | Why it matters (Cornell) |
|---|---|---|
| Panleukopenia (the P in FVRCP) | Feline distemper | Highly contagious and can be fatal, especially in kittens |
| Herpesvirus (the VR, rhinotracheitis) | Upper respiratory infection | Kittens are at higher risk |
| Calicivirus (the C) | Upper respiratory illness | Common; a rare, severe strain can be deadly |
| Rabies | Rabies | Almost always fatal once signs appear, and can infect people |
| FeLV, for kittens | Feline leukemia virus | Core under one year; for adults it depends on exposure |
That shared shot is the combination often called FVRCP, which is what you'll usually see on the invoice. Rabies is given on its own.
FVRCP plus rabies covers the core for adult cats. Kittens add FeLV in their first year.
Do indoor cats really need core vaccines?
Yes, indoor cats need the core vaccines. Cornell recommends them for household cats kept indoors at all times. Staying inside lowers some risks, but it doesn't remove them. Cats slip out the door when the groceries come in. People come and go. A bat or a new cat can bring disease right into the living room.
The 2020 feline vaccination guidelines from the American Animal Hospital Association and the American Association of Feline Practitioners go a step further. They say asking whether a cat is indoor or outdoor isn't enough anymore. Vets should think about brief outdoor access, balconies, open windows, visits to other homes, boarding and leash walks, plus the other cats in the household.
So before your visit, think it through. Does your cat ever go out on the balcony, into a catio or for a harness walk? Do you board, or use a sitter who has cats of their own? Do you foster or bring new cats home, or does someone in the house volunteer at a shelter? Those answers shape the non-core part of the plan.
Is the rabies vaccine required for cats in Ontario?
Yes. Under Ontario Regulation 567, cats, dogs and ferrets three months of age and older have to be immunized against rabies and re-immunized by the date on their certificate. The vet who gives the vaccine gives you that certificate. Keep it somewhere you'll find it, because boarding places and groomers often want proof.
The free PetGrid app can hold that proof. Its vaccine card is a PDF of your cat's vaccines with an optional QR code. It's a summary, though, not an official rabies certificate.
How does the kitten series and adult schedule work?
Kittens get a series of doses because antibodies from their mother's milk can block early vaccines. Cornell describes a series given over 12 to 16 weeks, starting at 6 to 8 weeks of age. WSAVA recommends doses every 2 to 4 weeks, with the last one at 16 weeks or older, then a revaccination at or after 26 weeks.
- Kitten series starting around 6 to 8 weeks.
- Final kitten dose at 16 weeks or older.
- A revaccination at or after 26 weeks.
- Adult boosters on the schedule your vet sets for each vaccine.
For adults, WSAVA advises that core vaccines shouldn't be given more often than necessary, because immunity from many of them lasts years. How often your cat needs each booster depends on the product and on your vet's judgment.
What about the stray who moved in last winter, or a rescue with no papers? Cornell says an adult cat with an unknown history should be treated as unvaccinated and given the full series. A cat who's simply overdue gets boosters to catch up.
Are cat vaccines safe?
For most cats, Cornell says, the benefits of a proper schedule outweigh the risks. Short-term reactions are mostly allergic. Every feline vaccine also carries a small long-term risk of a tumour at the injection site, called feline injection site sarcoma, which is uncommon.
Tell your vet about any reaction your cat has had before. And if you feel a lump at an injection site that doesn't go away, mention it.
If your cat has trouble breathing or seems very unwell after a vaccine, go to a vet or emergency clinic now.
Keep track of what your cat has had
Keeping track matters because vaccine dates go missing easily, especially after a move or a change of clinic. Add each vaccine with its next due date in your cat's pet records, and the reminders get made for you. If you've got a dog in the house too, our vaccine schedule for Canada puts both side by side.
Perguntas frequentes
What are the core vaccines for cats?
Panleukopenia, herpesvirus and calicivirus, usually combined as FVRCP, plus rabies. FeLV is also core for kittens under one year old.
Does my indoor cat need vaccines?
Yes, the core ones. The Cornell Feline Health Center recommends core vaccines even for cats kept indoors all the time, and Ontario law requires rabies vaccination for cats three months and older.
Is the FeLV vaccine necessary for adult cats?
It depends on exposure. FeLV is core for kittens under one year, but for adults it's non-core, so your vet decides based on whether your cat could meet infected cats.
How often do adult cats need booster shots?
It varies by vaccine and product, so ask your vet. WSAVA says core vaccines shouldn't be given more often than necessary, because immunity from many of them lasts years.
My rescue cat has no vaccine records. What happens now?
Your vet will usually treat your cat as unvaccinated. Cornell advises giving an adult cat with an unknown history the full vaccine series.
Em resumo
Every cat, indoor or not, needs the core vaccines: FVRCP and rabies, plus FeLV in that first year. The rest depends on how your cat really lives, so tell your vet about the balcony, the boarding and the other cats at home. Don't round it down to "indoor".
Keep every vaccine date and proof in one place so boosters don't slip by. The PetGrid app is free for pet owners.
Guarde os registros, as vacinas e as consultas do seu pet em um só lugar seguro. O app PetGrid é gratuito para tutores, com ou sem clínica.
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