Puppy Vaccination Schedule: What Happens at 6, 9, 12 and 16 Weeks

Puppies get a series of shots rather than one, starting at 6 to 8 weeks and finishing at 16 weeks or later. The gaps exist because antibodies from the mother's milk fade at different speeds in different puppies. Your puppy is not fully protected until 1 to 2 weeks after the final dose, so around 17 to 18 weeks old.

What the Core Vaccines Cover

Core vaccines protect against distemper, parvovirus, infectious hepatitis and rabies. Distemper and parvovirus kill puppies, and parvovirus survives in soil for months to years, so shared ground is a real risk for an unvaccinated puppy. Rabies is a legal requirement in most countries. Puppies that survive distemper often carry lifelong twitching or damage to the tooth enamel.

Non-core vaccines cover leptospirosis, kennel cough, Lyme disease and canine influenza. Vets pick these from local risk: leptospirosis where there is standing water or wildlife, kennel cough before boarding, Lyme in tick-heavy regions. Ask which ones your puppy needs and why, and skip the ones with no local cause. Raising the question at the first visit lets the series include what your area needs.

The Standard Timeline From 6 to 16 Weeks

Most vets start at 6 to 8 weeks with a combination vaccine. Doses repeat every 2 to 4 weeks after that, and many protocols now finish at 16 weeks or later because a shot given too early can be blocked by maternal antibodies. A dose missed by more than a week can reset the schedule, so keep appointments close together.

Alongside the shots, puppies are dewormed at 2, 4, 6, 8 and 12 weeks, with a faecal test for giardia and other parasites. Book the first visit the week you bring the puppy home so the timing anchors to a real start date rather than a guess.

• 6 to 8 weeks - first combination vaccine plus a full health check
• 10 to 12 weeks - second combination vaccine, plus leptospirosis where it is used
• 14 to 16 weeks - final combination vaccine, kennel cough if boarding is planned
• 12 to 16 weeks - rabies vaccine, single dose, certificate issued
• 12 to 16 months - booster, then every 1 to 3 years depending on the vaccine

Why the Series Beats a Single Shot

Antibodies from colostrum fade somewhere between 6 and 16 weeks, and the exact week differs from puppy to puppy. A shot given while those antibodies are still strong is neutralised and produces no lasting immunity. The puppy looks vaccinated on paper and carries no protection at all.

Repeating every 2 to 4 weeks keeps offering the immune system fresh chances until the maternal protection has gone. No test done in the consulting room can tell you whether the maternal antibodies have dropped yet. That is why a due date is a window rather than a deadline, and why vets rarely drop the 16-week dose even when a puppy has already had two.

The Socialisation Window and What Is Safe

The socialisation window closes around 14 to 16 weeks, before the series ends. Keeping a puppy indoors until 17 weeks produces a fearful adult, and fear-based behaviour problems outlast most infections in cost and heartache. Puppies that meet 100 different people and a dozen calm adult dogs before 16 weeks are less fearful for life. The compromise is controlled contact.

Carry the puppy in your arms in public, invite vaccinated healthy adult dogs into your own yard, and join a puppy class that checks vaccination and disinfects its floor. Avoid dog parks, pet shop floors, communal water bowls, and any dog whose vaccination status you do not know. Parvovirus rides on shoes and hands, so leave footwear at the door after a park or a clinic visit.

Records, Boarding and Titre Tests

Keep a written record of the date, vaccine name and batch label for every dose, signed by the vet. Boarding kennels, groomers, training clubs and border crossings all ask for proof, and a missing rabies certificate can mean quarantine after a bite. Photograph each certificate and keep the images on your phone.

Titre tests measure antibody levels and can replace some repeat boosters for distemper, parvovirus and hepatitis. Rabies is the exception: most places require it on a fixed schedule with no titre exemption. Never give a vaccine at home or buy doses online to save a consultation fee. If a puppy swells, breaks out in hives or vomits within an hour of a shot, call the clinic straight away.