Indoor Is a Lower-Risk Life, Not a Germ-Free One
It is reasonable to assume a cat who never leaves the flat barely meets the outside world, but pathogens do not need the cat to travel — they travel to the cat. Several common feline viruses survive well on surfaces and are carried indoors on shoes, hands and clothing after contact with other cats or contaminated environments. Then there are the journeys even indoor cats make: vet visits where sick cats have waited in the same room, a stay in a boarding facility during your holiday, a house move with doors standing open, or the two hours a startled cat spends missing after slipping out. Vaccination planning is really about those moments, which happen to almost every indoor cat eventually, rather than about the quiet weeks in between.
What 'Core' Means and Why Vets Apply It to Indoor Cats
Vets divide feline vaccines into core — recommended for essentially every cat regardless of lifestyle — and additional ones matched to specific risks. Core protection covers diseases that are widespread, severe, or transmissible in ways an indoor life cannot reliably prevent; rabies protection sits in this conversation too, because it can be a legal requirement in some places and because a single bat in the house or one escape changes the exposure picture completely. The point for indoor owners is that 'core' was defined with cats like theirs in mind: the recommendation already assumes a low-contact life and still lands on yes.
The Indoor Cat's Real Exposure Calendar
It helps to list the situations that puncture the indoor bubble, because owners often find more of them than expected. A new kitten or rescue cat joining the household brings an unknown disease history into direct contact. Guests who own cats handle yours with unwashed hands. A cat sitter visits several homes a day. Boarding and grooming facilities require proof of vaccination precisely because they concentrate cats. Even a landlord's repair visit can leave a door ajar.
Kittens, Boosters and the Senior Indoor Cat
Age shapes the plan at both ends. Kittens need a primary course in their first months because the protection they received from their mother fades on a schedule that leaves a vulnerable window, and 'he will be an indoor cat' does not close that window. Adult indoor cats need boosters at the intervals their vet advises to keep protection valid; letting them lapse for years can mean restarting rather than simply topping up, and it can leave a gap if boarding or an emergency vet stay arrives unexpectedly. For senior cats or those with chronic illness, the conversation becomes individual — your vet weighs ongoing protection against the cat's health status and stress from visits, and may adjust which vaccines and intervals make sense. In every case the owner who can produce an accurate, dated record gets a better-tailored answer than one working from memory.
Records Are Part of the Protection
A vaccination only counts, practically speaking, if you can prove it: boarders, airlines, new vets and even some landlords ask for the record, not your recollection. Keep the record with your cat's other health papers, note booster due dates where you will actually see them, and revisit the 'indoor, so maybe not' question at each annual visit rather than letting a decision made for a kitten silently govern a ten-year-old cat whose life has since acquired a dog, a garden flat or a regular boarding routine. The goal is a schedule fitted to your cat — neither skipped out of an assumption nor loaded with extras their life does not call for. KinsLe's Pet Passport holds your cat's vaccination history together with the rest of their records in one portable packet, so proof is ready for the vet, the boarder or the new home without a search through old paperwork.