Dog and cat vaccination: the complete guide

Vaccination remains one of the greatest advances in veterinary medicine: it has pushed back diseases that were once often fatal, such as parvovirus and distemper. Yet the same questions keep coming up: which vaccines are really essential? At what age should you start? Is a booster every year necessary? This complete guide, based on the recommendations of the WSAVA Vaccination Guidelines Group (World Small Animal Veterinary Association), answers them all, for dogs and cats alike.

How does a vaccine work?

It all relies on immune memory. By introducing an inactivated, attenuated or recombinant form of a pathogen, the vaccine “trains” the immune system to recognise the enemy without causing the disease. When real exposure happens, the body mounts an immediate response (antibodies and memory cells) that stops the disease from developing or greatly reduces its severity.

Beyond individual protection, a widely vaccinated population benefits from herd immunity: the less viruses circulate, the better protected the most vulnerable animals are (very young, senior or immunocompromised) who cannot always be vaccinated.

Core and non-core vaccines

WSAVA divides vaccines into two categories. Core vaccines protect against serious, widespread and often fatal diseases: they are recommended for all animals, everywhere in the world. Non-core vaccines depend on lifestyle (outdoor access, living with other animals, region, travel) and are decided with your vet.

Species	Core vaccines	Non-core vaccines
Dog	Distemper, infectious canine hepatitis, parvovirus (+ rabies for travel / where required)	Leptospirosis, kennel cough (Bordetella / parainfluenza), Lyme disease, leishmaniasis, babesiosis (piroplasmosis)
Cat	Feline panleukopenia (feline distemper), cat flu (herpesvirus + calicivirus) (+ rabies for travel)	Feline leukaemia (FeLV), chlamydiosis

In dogs: the diseases covered

• Distemper (D): a highly contagious virus affecting the respiratory and digestive tracts and the nervous system. Often fatal in puppies.
• Infectious canine hepatitis (H): an adenovirus infection that attacks the liver, kidneys and eyes.
• Parvovirus (P): a rapid, severe haemorrhagic gastroenteritis, one of the leading causes of death in unvaccinated puppies.
• Leptospirosis (L): a bacterial disease spread by rodent urine and stagnant water, transmissible to humans (zoonosis). Annual booster.
• Kennel cough: a highly contagious tracheobronchitis; vaccination is recommended before a stay in a boarding kennel or a grooming appointment.
• Rabies (R): fatal, transmissible to humans, subject to strict regulations (travel, and in France for “categorised” dogs).

In cats: the diseases covered

• Panleukopenia (feline distemper): an extremely hardy virus in the environment, causing a drop in white blood cells and severe diarrhoea, often fatal.
• Cat flu: a combination of herpesvirus and calicivirus that can become chronic and debilitating.
• Feline leukaemia (FeLV): a virus spread through saliva and blood, causing immunodeficiency and cancers. The vaccine is advised for cats with outdoor access.
• Rabies: mandatory for travelling outside mainland France.

Note: there is no FIV vaccine (“feline AIDS”) on the market in Europe; prevention relies on limiting fights and testing.

The vaccination schedule for puppies and kittens

Protection never comes down to a single injection. The primary vaccination course involves several injections close together, because antibodies passed on by the mother can neutralise the vaccine as long as they are present. That is why WSAVA now recommends that the last injection is given at 16 weeks or older.

Age	Dog	Cat
6–8 weeks	1st injection (distemper, hepatitis, parvovirus)	1st injection (panleukopenia, cat flu)
12 weeks	2nd injection (+ leptospirosis, ± rabies)	2nd injection (+ FeLV if outdoors)
16 weeks	Final injection (essential against parvovirus)	Final injection
1 year	1st booster	1st booster
After that	Core vaccines every 3 years; leptospirosis and rabies depending on the vaccine	Core vaccines every 3 years; FeLV yearly

Boosters: do you really need to vaccinate every year?

This is one of the major changes in veterinary vaccinology. Studies on duration of immunity (DOI) have shown that core vaccines protect for much longer than a year. After the booster given one year after the primary course, WSAVA recommends giving core vaccines only every 3 years. Non-core vaccines (leptospirosis, kennel cough), on the other hand, give shorter immunity and need an annual booster. The yearly vet appointment is therefore still worthwhile: it combines a health check with targeted boosters.

Are vaccines dangerous?

Vaccines are among the most closely monitored medical procedures. Mild reactions (a day of lethargy, slight swelling at the injection site, short-lived fever) are common and harmless. Serious reactions (allergy, anaphylactic shock) are rare and occur within minutes or hours of the injection. In cats, a rare type of tumour, injection-site sarcoma (around 1 to 3 cases per 10,000 vaccinations), has led vets to standardise injection sites and favour suitable vaccines. In the vast majority of cases, the benefit of vaccination far outweighs the risk.

What about exotic pets: rabbits, ferrets?

• Rabbit: vaccination is recommended against myxomatosis and rabbit haemorrhagic disease (RHD, including the RHDV2 variant), often as a single combined yearly injection.
• Ferret: very susceptible to distemper (fatal), ferrets should be vaccinated; rabies is required for travel.

Vaccination, travel and group settings

To travel within the European Union, rabies vaccination is mandatory and must be recorded in the European pet passport, with prior identification. Many boarding kennels, campsites and groomers require an up-to-date record (core vaccines, often plus kennel cough). Plan ahead: after the first rabies vaccination there is a waiting period before the vaccine is valid for travel.

Never miss a booster with Son Espace Santé

Keeping a paper booklet quickly gets complicated, especially with several pets. Son Espace Santé brings everything together:

• Paperless: photograph your vaccine stickers, stored in a secure cloud hosted in France.
• Smart reminders: automatic alerts 1 month and then 1 week before each due date.
• Sharing with your vet: send the vaccination history in one click to a new vet or in an emergency.
• Multi-species: dog, cat, ferret or rabbit — each protocol is tracked specifically.

Frequently asked questions

At what age should you vaccinate a puppy or kitten?

The primary course starts at around 6 to 8 weeks, with injections 3 to 4 weeks apart. The last injection should be given at 16 weeks or older, because maternal antibodies can neutralise the vaccine before that age. A booster follows at 6 or 12 months.

Should an indoor cat be vaccinated?

Yes for the core vaccines: panleukopenia is very hardy and can be brought into the home on shoes. FeLV vaccination, however, is only useful for cats with outdoor access.

Is vaccination mandatory in France?

No vaccine is legally mandatory in mainland France, except rabies for travelling abroad, for “categorised” dogs and often for boarding kennels. Core vaccines are still strongly recommended.

Can boosters be spaced out?

Yes for core vaccines (a booster every 3 years after the reference year), but not for leptospirosis and kennel cough, which remain yearly.

How much does vaccination cost?

As a rough guide in France: €70 to €110 for a puppy's or kitten's full primary course, and €40 to €70 for the annual booster, depending on the diseases covered and the region.

In summary

Vaccination is a simple, safe and effective preventive measure that gives your pet a longer life, protected from avoidable diseases. Tell core vaccines apart from non-core ones, complete the primary course up to 16 weeks, and tailor boosters to your pet's lifestyle with your vet. An up-to-date health record — ideally digital — is your best ally to never miss a due date.