Dog Vaccination Schedule: Complete Updated Calendar and Everything You Need to Know

by Karina Caribana September 18, 2026

Vaccines have saved more canine lives than any other veterinary advance in history. Diseases that once wiped out entire litters —distemper, parvovirus— are now perfectly preventable with a simple, inexpensive schedule. Yet between mandatory vaccines, optional ones, booster doses and schedules that vary from country to country, it's easy to feel lost.

The good news is that you don't need to memorise anything: you just need to understand what each vaccine protects against, when it should be given and why boosters matter. In this guide, updated for 2026, we go through the complete schedule from 6 weeks of age to adulthood, the essential and optional vaccines, how to prepare for each vet visit and what the regulations in Spain, Mexico, Argentina and the United States require.

Why vaccines save millions of lives every year

A vaccine works as a "dress rehearsal" for the immune system. It introduces a harmless version of the pathogen (or an instruction to make one of its proteins), and the body learns to recognise and fight it without going through the actual disease. When the real virus arrives, the dog already has its defences ready.

Thanks to this, diseases that were a death sentence decades ago are now controlled rarities. Canine parvovirus, for example, kills most unvaccinated puppies that catch it; with the full course, protection exceeds 95 %. Rabies, moreover, is a deadly zoonosis: vaccinating your dog also protects your family and complies with the law.

The period of greatest risk is the window of vulnerability: between 6 and 16 weeks of age, the antibodies the puppy received from maternal colostrum begin to fade, but can still interfere with the vaccine. That's why several doses are given in a row: each one "pushes" immunity along until the puppy's system responds on its own.

Complete vaccination schedule: from 6 weeks to adulthood

Although every vet adjusts the schedule to the dog's lifestyle and region, this is the reference scheme used today in most countries:

Age	Usual vaccines	Notes
6-8 weeks	First combination vaccine (distemper, parvovirus, hepatitis, parainfluenza)	The course starts if the mother was vaccinated
10-12 weeks	Second combination + first leptospirosis	Boosts immunity; adds bacterial vaccines depending on risk
14-16 weeks	Third combination + rabies	Key dose: usually the one that "closes" protection
6-12 months	Booster of combination and rabies	Some protocols give it at exactly one year
Adult (1-7 years)	Boosters according to the product	Combination every 1-3 years; rabies according to legal regulations
Senior (7+ years)	At the vet's discretion	Schedule and individual immune status are reviewed

Rule of thumb: a puppy should not go out on the street until 1-2 weeks after its last dose of the initial series. Until then, you can socialise it in your arms or in controlled, disinfected areas — never on pavements, in parks or in areas with heavy dog traffic.

A detail that is often forgotten: if the puppy started the course after 16 weeks, two doses 3-4 weeks apart are usually enough. Always check the exact scheme with your vet.

The essential vaccines, one by one

These are the ones that protect against the most serious and contagious diseases. In most countries, the first four make up the so-called combination vaccine (or "pentavalent", depending on how many components the product includes).

Canine distemper

A virus that attacks the respiratory, digestive and nervous systems. It starts like a simple cold —fever, nasal discharge, cough— and can lead to pneumonia, vomiting, diarrhoea and, in advanced stages, seizures and irreversible tremors. The mortality rate is high and there is no cure: only supportive treatment. It is especially cruel in puppies.

Parvovirus

The dreaded "parvo". It causes brutal haemorrhagic gastroenteritis, with vomiting, bloody diarrhoea and rapid dehydration. It is a very resistant virus in the environment —it survives for months in the soil— and extremely contagious. Puppies are the most vulnerable. The vaccine is the only real protection.

Canine infectious hepatitis (adenovirus type 1)

It affects the liver and can cause acute liver damage, clotting disorders and eye problems (the so-called "blue eye"). It is less common than the previous ones, but potentially fatal, and is included in the combination vaccine.

Rabies

The only vaccine required by law in Spain, Mexico, Argentina and practically all of Europe and the Americas. It is a neurological disease that is fatal once symptoms appear, and it is transmitted to people through bites. The first dose is given from 12-16 weeks (depending on the country) and is boosted every 1-3 years. Without it, your dog cannot travel or obtain the European pet passport.

Optional vaccines: when to say yes and when not to

Not every dog needs them. They are recommended based on lifestyle, region and risk of exposure. Your vet will assess "non-core vaccines" (not mandatory, but sometimes highly advisable):

Kennel cough (Bordetella bronchiseptica + parainfluenza): highly contagious in enclosed spaces with many dogs. Recommended if your dog goes to boarding kennels, daycare or groomers, attends shows, or frequently mixes with other dogs. It is given intranasally or by injection, with a booster every 6-12 months.
Leptospirosis: a bacterial disease transmitted through the urine of rodents and contaminated water (puddles, rivers, lakes). It affects the liver and kidneys and is a zoonosis (it can infect humans). Highly advisable for rural dogs, hunting dogs or dogs that drink from natural sources.
Lyme disease (Borrelia): transmitted by ticks. It is advised in endemic areas and for field or mountain dogs with high tick exposure. It does not replace a good parasite treatment.
Other special cases: canine coronavirus (enteritis) or the Leishmania vaccine in endemic Mediterranean areas, at the vet's discretion.

Key idea: an optional vaccine "that isn't due" is not an unnecessary expense, but nor should they be given "just in case". The balance is set by your dog's real risk.

Before and after the vaccine: preparing the visit and watching for reactions

Vaccination is a routine procedure, but there are details that improve the experience and safety.

How to prepare for the visit

Make sure the dog is healthy. A dog with fever, diarrhoea or active illness is not vaccinated; the immune system must be available.
Bring the vaccination card or health passport so the vet can record the batch, date and product.
Review the general condition with the vet: weight, auscultation, teeth. The vaccine visit is a miniature health check.
Deworm beforehand, if applicable: a dog with parasites responds worse to the vaccine.

Normal reactions

After the injection it is common to see, for 24-48 hours:

Slight swelling or pain at the injection site.
Tiredness, some sleepiness and reduced appetite.
A mild low-grade fever and, in some cases, a small lump that is reabsorbed.

They normally require nothing more than rest and affection.

Warning signs (go to the vet immediately)

Repeated vomiting, diarrhoea or swelling of the face, muzzle or eyelids.
Difficulty breathing, excessive salivation or hives on the body.
Seizures, extreme lethargy or pale gums.
A lump at the injection site that grows after 2-3 weeks.

Severe allergic reactions are very rare (fewer than 1 in 10,000 vaccinations), but it's worth knowing how to recognise them. Curiously, most adverse reactions occur on the second or third dose of the series, not the first.

Differences between countries and international travel

Although the scientific basis is the same, the regulations change. This is the essentials:

Country	Rabies	Particularities
Spain	Mandatory from 3 months; booster according to the autonomous community	European pet passport mandatory to move within the EU; from 2026, some communities update the frequency
Mexico	Mandatory from 3 months; annual booster	Vaccination record required; rabies is under strict health monitoring
Argentina	Mandatory from 3 months; annual booster	Required for transfers and in urban centres; valid anti-rabies vaccination certificate
United States	Mandatory in practically all states; interval of 1-3 years depending on the state	Rabies requirement to cross borders and travel to many countries

If you plan to travel: the rabies vaccine must be given at least 21 days before the trip (depending on the destination) and the dog needs a microchip, passport and health certificate. Some countries require a rabies antibody test. Plan it months in advance; this is not something you improvise.

Conclusion: the cheapest and least painful prevention

Vaccinating is not a formality: it is the most cost-effective health decision you will make for your dog. The cost of a full course is a fraction of treating parvovirus or hospitalising for distemper, and it also protects other dogs and people against diseases such as rabies or leptospirosis.

Your action plan is simple:

Check the vaccination card and see where the schedule stands.
Contact your vet if there are pending boosters.
Tell essential from optional according to your dog's lifestyle.
Note the booster dates so you don't lose track.

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This article is for information only and does not replace a vet's diagnosis or treatment. Always check your dog's vaccination schedule with a professional.