Cat vaccinations get less attention than dog shots – fewer legal requirements, fewer boarding-kennel demands – and as a result more confusion. What does a kitten actually need? Does a cat who never goes outside need anything at all? Here is the schedule and the reasoning, in plain language. (Dog owner too? See our puppy vaccination guide.)
Why kittens need a series of shots
Kittens drink protective antibodies in their mother’s first milk, and that borrowed immunity fades unpredictably between 6 and 16 weeks – while also blocking vaccines from working. The kitten series (doses every 3-4 weeks until about 16 weeks) exists to make sure that whenever the maternal shield drops, a vaccine dose is there to replace it. Gaps or delays leave windows with no protection at all, which is why finishing the series on schedule matters more than starting it early.
The core vaccines every cat should have
FVRCP – the combination shot
One injection covering three diseases: feline viral rhinotracheitis (herpesvirus) and calicivirus – the two causes of most “cat flu”, miserable and highly contagious – and panleukopenia (feline parvovirus), a frequently fatal gut virus so hardy it survives in environments for a year. Typical schedule: doses at 6-8, 10-12 and 14-16 weeks, a booster at one year, then every three years for most adult cats.
Rabies
Usually given once at 12-16 weeks, boosted at one year, then per local law and vaccine type. In many places it is legally required even for indoor cats – and rabies is the vaccine you will need proof of for travel and boarding.
FeLV (feline leukaemia) – core for kittens
Modern guidelines treat FeLV as core for all kittens (two doses from about 8 weeks), because young cats are most susceptible and life plans change. Whether adult boosters continue depends on lifestyle: essential for cats who go outside or live with FeLV-positive housemates; often dropped for confirmed strictly-indoor adults.
“But my cat never goes outside”
The honest answer: indoor cats need fewer vaccines, not zero. Panleukopenia and cat-flu viruses travel on shoes, clothes and hands – no cat contact required. Indoor cats escape (and unvaccinated escapees face the outdoor virus pool with no preparation), house moves and new housemates happen, and emergencies can mean sudden boarding among other cats, where proof of vaccination is mandatory. The pragmatic indoor-cat package most vets recommend: the full kitten series, the one-year boosters, then FVRCP every three years plus whatever rabies schedule local law requires. That is a light schedule for a lot of insurance – see our indoor vs outdoor guide for the wider lifestyle trade-offs.
Side effects and the sarcoma question
Expect possible sleepiness, mild fever or a small tender lump for a day or two. Emergency signs – facial swelling, vomiting, breathing trouble within hours – are rare and need a vet immediately. Cat owners who research also meet the term “injection-site sarcoma”: a rare tumour associated with injections in cats. It is genuinely rare, modern vaccines and injection-site practices reduce the risk further, and the diseases vaccines prevent kill vastly more cats than sarcomas do. Mention any lump at an injection site that persists beyond a month to your vet.
Keeping it on track
Book the next appointment before leaving the current one, keep the vaccination record filed (boarding catteries and travel both demand it), and fold boosters into the annual checkup so they never become a separate errand. Costs are modest as veterinary spending goes – our vet costs guide and annual cat cost guide put them in context – and prevention here is dramatically cheaper than treating any of the diseases on this page.
