Kitten Vaccine and Deworming Timeline: 2 Weeks to 12 Months

The kitten vaccine series is not one appointment. It is a schedule that starts at six to eight weeks, repeats every three to four weeks, and does not finish until the kitten is at least sixteen weeks old. That deadline is the part owners miss: a kitten vaccinated twice and declared "done" at twelve weeks is the classic case of a cat that later gets panleukopenia anyway. Deworming runs on a separate, tighter calendar that begins at two weeks, before any vaccine is given.

Why the last dose has to wait for 16 weeks

Antibodies a kitten drinks in colostrum protect it for the first weeks of life, and then become a problem. They block the vaccine from stimulating the kitten's own immune response, and nobody can tell by looking at a kitten when those maternal antibodies have fallen low enough. The level decays at a different rate in every kitten, somewhere between eight and sixteen weeks. So the series is repeated until the earliest possible moment every kitten is likely to be unprotected: sixteen weeks, or a little after.

That is why three doses are standard: each is a bet that this is the one landing after the maternal antibodies fade. A kitten given two, or given its last at twelve weeks, may have no protection despite a full vaccination card.

The schedule, week by week

Doses vary by country and by your vet's protocol; this is the common core. Local law overrides it, particularly for rabies.

Age	What happens	Notes
2 weeks	First deworming	Then every two weeks; kittens are infected through the queen's milk
4 weeks	Deworming	Weight-based dose, weighed on the day
6 weeks	Deworming; first exam if not done	Fecal test, ear mites, flea check, weight
8 weeks	FVRCP #1; deworming; FeLV/FIV test	Some vets start the series here, some at 6 weeks
10 weeks	Deworming	—
12 weeks	FVRCP #2; FeLV #1; rabies where allowed	Rabies timing depends on local law and product
14 weeks	Deworming	Last of the two-week intervals
16 weeks	FVRCP #3; FeLV #2; rabies if not yet given	The dose that counts; microchip can go here
4-6 months	Monthly deworming until 6 months; spay or neuter	FeLV/FIV retest at 6 months if the first was unclear
12 months	FVRCP and rabies booster	Then every one to three years per product and law

The vaccine calendar tool will turn your kitten's birth date into actual dates, which is worth doing once: the intervals are what matter, not the weekday of your appointment.

Deworming is not optional and not annual

Roundworms are the reason the deworming schedule looks so aggressive. A queen with dormant larvae passes them to kittens through milk, and a kitten can be shedding eggs by three weeks, before any vaccine is on board. The standard kitten protocol is treatment every two weeks from two weeks of age until twelve weeks, then monthly until six months, then three or four times a year for life in a cat that hunts or goes outside.

Weigh the kitten on the day and dose to the weight, not the age. A product labelled for two kilograms given to a 700 g kitten is an overdose, and half a tablet guessed by eye is how treatment failure starts. If there is diarrhoea, ask for a fecal flotation instead of reaching for the same wormer again: giardia and coccidia are common in kittens and neither responds to one.

Rabies, FeLV and the non-core decisions

Rabies is core in most countries and legally required in many. It is usually given as a single dose at twelve to sixteen weeks, boosted at one year, then every one to three years according to the product license and local law. There is no titre that exempts a cat from a legal requirement.

Feline leukaemia virus is the vaccine owners ask about most. It is recommended for kittens as a two-dose series three to four weeks apart, because young cats are more susceptible and because the cat's future lifestyle is unknown at eight weeks. An adult indoor cat with no exposure risk may reasonably skip it. The FeLV/FIV blood test is separate from the vaccine and belongs at the first visit; a positive result in a kitten under six months can reflect maternal antibodies, so it is repeated at six months before anyone makes a decision.

After the appointment

Mild lethargy, a tender shoulder and a little reduced appetite for twenty-four to forty-eight hours are ordinary, as is a small soft lump that disappears within a few weeks. Feed normally, skip rough play for a day, and give no painkiller without asking: paracetamol and most human anti-inflammatories are toxic to cats.

Go back the same day for facial swelling, vomiting, diarrhoea, wobbliness, difficulty breathing or collapse, which can start within minutes of a shot and is treatable if you turn around quickly. A lump still there three months later, larger than 2 cm, or still growing a month after the injection should be examined rather than watched: injection-site tumours are rare but real.

Missing a dose, or starting late

An interrupted series is resumed, not restarted. If the gap is a few weeks, carry on from where you stopped and push the final dose to sixteen weeks or beyond. A kitten over sixteen weeks with no vaccines gets two doses three to four weeks apart, then adult boosters.

An adult cat of unknown history is the same: two doses three to four weeks apart, then routine boosters. A kitten that has finished its series should still stay away from unknown cats and ground used by strays until about a week after the final dose.

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