Vaccines save lives. This is not an exaggeration or a veterinarian trying to sell services. Diseases like distemper and parvovirus kill thousands of dogs every year in Brazil, most of them unvaccinated or with incomplete vaccination.
The vaccination protocol can seem confusing at first: V8, V10, rabies, boosters... I'll try to explain clearly what each vaccine does and when it should be applied.
Basic schedule for puppies
The standard protocol for puppies in Brazil involves three doses of the multiple vaccine (V8 or V10) plus rabies. The interval between multiple vaccine doses is 21 to 30 days. Rabies is usually given with the last dose or shortly after.
| Age | Vaccine | Note |
|---|---|---|
| 6-8 weeks | V8 or V10 (1st dose) | First dose of protocol |
| 9-11 weeks | V8 or V10 (2nd dose) | 21-30 days after the first |
| 12-14 weeks | V8 or V10 (3rd dose) | 21-30 days after the second |
| From 12 weeks | Rabies | Single dose |
Why three doses? Because puppies receive antibodies from their mother through milk, and these maternal antibodies can "neutralize" the vaccine. The problem is we don't know exactly when these antibodies disappear, so we give multiple doses to ensure at least one "takes" when the puppy is receptive.
V8 or V10: what's the difference?
Both protect against the main canine diseases. The difference is in the number of leptospirosis types included.
V8 protects against: distemper, parvovirus, coronavirus, infectious hepatitis, adenovirus, parainfluenza and 2 types of leptospirosis.
V10 includes all of that plus 2 more types of leptospirosis, totaling 4 types.
In practice, most veterinarians in Brazil use V10 as standard. The cost is slightly higher, but protection is broader. It's not worth saving here.
Rabies: mandatory by law
Rabies is fatal in virtually 100% of cases, for both animals and humans. That's why the vaccine is mandatory throughout Brazil. Many municipalities hold annual free campaigns.
The protocol is simple: one dose from 3 months of age, with annual booster. Some veterinarians and manufacturers already work with vaccines that last 3 years, but Brazilian legislation still requires annual proof in many places.
Other vaccines: do I need them?
In addition to basic vaccines, there are others that may be recommended depending on your dog's lifestyle.
Giardia
Protects against giardiasis, an intestinal infection caused by protozoa. The vaccine does not completely prevent infection, but reduces severity and parasite elimination in feces.
Recommended for dogs that frequent areas with many other dogs or have access to water of questionable origin. It's given in two doses with an interval of 21-30 days.
Kennel Cough (Bordetella + Parainfluenza intranasal)
"Canine flu" is highly contagious in environments with many dogs. If yours frequents daycares, hotels or shows, this vaccine makes sense. It's applied in the nose (intranasal) and has a faster effect than injectable vaccines.
Leishmaniasis
Visceral leishmaniasis is serious and endemic in several regions of Brazil. The vaccine is not 100% effective and needs to be combined with other prevention measures such as repellent collars.
If you live in an endemic area or travel frequently to these regions, talk to your veterinarian about this vaccine. It can only be applied to dogs that tested negative for the disease.
Vaccine reactions: when to worry?
Most dogs have no reaction. Some may be a bit quieter in the first 24 hours, or have sensitivity at the injection site. This is normal and passes.
Reactions that require veterinary attention:
- Swelling in the face, especially nose and eyes (may indicate allergic reaction)
- Difficulty breathing
- Persistent vomiting
- Intense diarrhea
- Large, painful lump at the injection site that doesn't decrease in a few days
Severe allergic reactions (anaphylaxis) are rare, but can happen. They usually occur in the first 30 minutes after application. That's why many veterinarians ask you to wait a bit at the clinic after vaccinating.
Annual boosters: are they necessary?
There's debate about this worldwide. Some studies suggest that certain vaccines confer immunity for longer than a year. In the United States and Europe, it's already common to use protocols with 3-year intervals for some vaccines.
In Brazil, most veterinarians still recommend annual booster of the multiple (V10) and rabies. Part of this is cultural, part is because sanitary conditions here are different.
What you can do is talk to your veterinarian about your dog's reality. A dog that stays only at home, has minimal contact with other animals and lives in an urban area with good infrastructure may have a different protocol than one that frequents dog-filled parks every day.
Where to vaccinate?
The ideal is always at a veterinary clinic, where vaccines are stored correctly and applied by a qualified professional. The cold chain is crucial: vaccines that were out of proper temperature lose effectiveness.
Public rabies vaccination campaigns are reliable and free. Keep an eye on your city hall announcements.
Avoid buying vaccines at pet shops to apply at home. Even if you know how to apply, inadequate storage can compromise the vaccine. And without professional application, you don't have a stamped vaccination card, which is required in various situations.
Vaccination myths
"Dogs that don't leave home don't need vaccines." Yes, they do. You leave home. You can bring viruses on the sole of your shoe. Visitors can bring them. And the dog will eventually go to the vet or pet shop.
"My dog got vaccinated and got sick, so vaccines don't work." Vaccines aren't 100%. And sometimes the dog was already incubating the disease before vaccination. But the protection that vaccines offer is statistically proven.
"Mixed-breed dogs are more resistant and don't need as many vaccines." Mixed-breed resistance has more to do with genetic diversity and natural selection. It doesn't mean immunity to viruses. Mixed-breeds need the same vaccines as purebred dogs.
Protocol summary
To keep it simple: V10 in three doses for puppies, rabies from 3 months, annual booster of both. Other vaccines according to veterinarian guidance based on your dog's lifestyle.
Keep the vaccination card up to date and in a safe place. You'll need it more often than you think.