Cat vaccinations: what they need, when, and what is optional

Vaccination is one of the few areas of cat care where the science is genuinely settled. The diseases the core vaccines protect against are common, often fatal, and almost entirely preventable. The confusion is not about whether to vaccinate, it is about which ones, how often, and whether a cat who never goes outside really needs them.

This guide lays out the schedule most vets work from, the difference between core and lifestyle vaccines, and the questions worth asking at your next appointment.

The core three

Nearly every veterinary body in the world agrees on three core vaccines, often given as one combined injection:

These three are recommended for every cat, indoor or out, because the viruses travel on shoes, hands and clothes. Your cat does not need to meet another cat to catch them; you can carry them home on your trainers after walking past a garden where an unvaccinated cat sneezed yesterday.

The kitten schedule

The standard course starts early because the protection kittens get from their mother's milk fades somewhere between six and sixteen weeks, and nobody can tell exactly when for a given kitten. The schedule hedges that gap:

1. 1First vaccination at 8 to 9 weeks old.
2. 2Second dose 3 to 4 weeks later, usually around 12 weeks.
3. 3A booster at 12 months, which is the one most often forgotten.
4. 4After that, a booster rhythm your vet sets, commonly every one to three years depending on the component and local risk.

Kittens should stay away from unknown cats and outdoor ground until a week or two after their second dose. That does not mean a house arrest of total silence: this is the golden window for socialisation, so invite the world in, just not the unvaccinated parts of it.

Lifestyle vaccines

Beyond the core three, the honest answer is it depends:

• Feline leukaemia virus (FeLV): strongly advised for any cat that goes outdoors, meets other cats, or lives with an FeLV-positive cat. Many guidelines call it core for kittens, since young cats are most at risk and their future lifestyle is unknown. FeLV spreads through close contact, shared bowls and mutual grooming, and it shortens lives.
• Rabies: legally required in many countries and for international travel. Indoor cats in rabies-free regions usually skip it, but if there is any chance of a move abroad, doing it early is far easier than doing it under deadline.
• Chlamydia and Bordetella: only for specific situations, usually multi-cat households or catteries with respiratory outbreaks.

The indoor cat question

A strictly indoor cat has a lower risk, but not zero. Panleukopenia survives for months on surfaces and rides in on your shoes. Herpesvirus and calicivirus move the same way. And the indoor-only plan has a habit of failing at the worst moment: a dash through an open door, a house move, a fire, an emergency cattery stay that turns out to require paperwork you do not have.

Vaccination is one of the rare decisions where doing the default thing is also doing the right thing.

There is a second, quieter argument. The diseases involved do not stay indoors either. Feline flu viruses are among the most contagious in the animal world, and a vet visit for an unrelated problem is itself a room full of other cats. The waiting room is where indoor cats meet the outdoors.

What it costs and what happens after

Expect roughly 60 to 120 euros for the kitten course and 40 to 80 per booster, varying by country and clinic. Most cats are back to normal within hours. A quiet evening, a slight dip in appetite or a small lump at the injection site are all common and pass within a day or two. Trouble breathing, facial swelling, vomiting or collapse are rare reactions and mean an immediate call to the clinic.

Keep the record booklet somewhere safe. Catteries, insurers, groomers and border officials will all ask for it before you do. A photo of each page in your phone costs nothing and survives lost wallets.

Getting there without the drama

The vaccination itself takes seconds. The journey is the ordeal. A carrier that lives in the living room as a piece of furniture, door open, blanket inside, occasional treats, stops being a trap and becomes a den. Spray it with a feline pheromone fifteen minutes before travel, cover it with a light cloth in the car, and most cats arrive in far better shape than their owners.

Verdict by household

For a new kitten owner, do not skip the twelve-month booster; it is the one that actually locks in long-term immunity, and it is the appointment most often forgotten in the calm after the kitten course. For a multi-cat home, vaccinate everyone on the same cycle, because one unprotected cat is a route in for the others. For an indoor-only household, the core three are still worth it, but you can reasonably decline the lifestyle extras after an honest conversation about whether your cat will ever really go out.

When to call your vet

If you have adopted an adult cat with no paperwork, do not guess: a vet can restart the course from scratch, safely, at any age. And if a vaccine lump grows for more than a few weeks rather than shrinking, have it looked at. Our kitten first-90-days guide fits vaccinations into the bigger picture, and the senior signals piece explains why boosters still matter at fourteen.