| Core dog vaccines | Rabies, DA2PP (Distemper, Adenovirus, Parvovirus, Parainfluenza) (AAHA Canine Vaccination Guidelines) |
| Core cat vaccines | Rabies, FVRCP (Rhinotracheitis, Calicivirus, Panleukopenia) (AAFP Feline Vaccination Guidelines) |
| Rabies vaccine — legal requirement | Required by law in most U.S. states for dogs; required in many states for cats (State and local regulations vary) |
| Puppy/kitten series start age | Typically 6–8 weeks of age (AAHA/AAFP vaccination guidelines) |
| Core booster frequency (adult) | Every 1–3 years depending on vaccine type (Varies by product and veterinarian recommendation) |
| FeLV vaccine recommendation | Strongly recommended for outdoor cats and multi-cat households (AAFP Feline Vaccination Guidelines) |
Core Vaccines: What Every Pet Needs
Core vaccines are recommended for all pets, regardless of lifestyle, because they protect against diseases that are widespread, severe, or transmissible to humans. Veterinary organizations — including the American Animal Hospital Association (AAHA) and the American Association of Feline Practitioners (AAFP) — have established these guidelines based on decades of clinical evidence.
| Core dog vaccines | Rabies, DA2PP (Distemper, Adenovirus, Parvovirus, Parainfluenza) (AAHA Canine Vaccination Guidelines) |
| Core cat vaccines | Rabies, FVRCP (Rhinotracheitis, Calicivirus, Panleukopenia) (AAFP Feline Vaccination Guidelines) |
| Rabies vaccine — legal requirement | Required by law in most U.S. states for dogs; required in many states for cats (State and local regulations vary) |
| Puppy/kitten series start age | Typically 6–8 weeks of age (AAHA/AAFP vaccination guidelines) |
| Core booster frequency (adult) | Every 1–3 years depending on vaccine type (Varies by product and veterinarian recommendation) |
| FeLV vaccine recommendation | Strongly recommended for outdoor cats and multi-cat households (AAFP Feline Vaccination Guidelines) |
Core Vaccines for Dogs
- Rabies: Required by law in most U.S. states. Protects against a fatal viral disease that can spread to humans. Initial vaccine is followed by boosters every 1–3 years, depending on the product and local regulations.
- DA2PP (Distemper, Adenovirus, Parvovirus, Parainfluenza): Often called the "distemper combination" shot. Parvovirus is especially dangerous in puppies and can be fatal without treatment.
Core Vaccines for Cats
- Rabies: Required by law in many states, even for indoor cats.
- FVRCP (Feline Viral Rhinotracheitis, Calicivirus, Panleukopenia): Commonly called the "feline distemper" combination. Panleukopenia in particular has a high mortality rate in unvaccinated cats.
Core vaccines are typically started during a pet's first weeks of life and given in a series to build lasting immunity. See how vaccine schedules shift across life stages for details on timing from puppyhood through senior years.
Non-Core Vaccines: Lifestyle and Risk-Based Protection
Non-core vaccines are given based on a pet's individual risk factors — where they live, how often they interact with other animals, and what environments they encounter. Your veterinarian will assess these factors during a wellness visit.
Core Vaccine
A vaccine recommended for all pets of a given species, regardless of lifestyle. Core vaccines target diseases that are severe, widespread, or pose a public health risk.
Non-Core Vaccine
A vaccine given only to pets with specific risk factors, such as outdoor exposure, frequent contact with other animals, or travel to certain regions.
Titer Test
A blood test that measures the level of protective antibodies a pet already has. Results help vets decide whether a booster vaccine is necessary.
Zoonotic Disease
A disease that can be transmitted between animals and humans. Rabies and leptospirosis are examples relevant to pet vaccination.
Primary Vaccine Series
The sequence of initial vaccines given to young animals, spaced weeks apart, to build immunity as maternal antibodies from the mother gradually decline.
Non-Core Vaccines for Dogs
- Bordetella (Kennel Cough): Recommended for dogs that visit groomers, dog parks, boarding facilities, or training classes. Many facilities require proof of this vaccine. See what to prepare before boarding your pet.
- Leptospirosis: A bacterial infection spread through contaminated water and wildlife urine. Relevant for dogs with outdoor exposure, especially in rural or flood-prone areas. Also zoonotic — meaning it can infect humans.
- Lyme Disease: Recommended in tick-heavy regions of the U.S., particularly the Northeast and upper Midwest. Best used alongside consistent tick prevention. Learn more about tick prevention strategies.
- Canine Influenza (H3N2/H3N8): Particularly relevant for dogs in shelters, dog shows, or areas with confirmed outbreaks.
Non-Core Vaccines for Cats
- Feline Leukemia Virus (FeLV): Strongly recommended for outdoor cats or those in multi-cat households. FeLV suppresses the immune system and has no cure.
- Feline Immunodeficiency Virus (FIV): Considered for outdoor cats at high risk of bite wounds from unfamiliar cats.
- Bordetella and Chlamydophila: Occasionally recommended for cats in crowded environments such as shelters or multi-cat homes.
Vaccine Reactions: What's Normal vs. What's Not
Mild soreness at the injection site, low-grade lethargy, or a slight fever for 24–48 hours after vaccination are generally considered normal responses. More serious signs — such as facial swelling, vomiting, difficulty breathing, or collapse — may indicate an allergic reaction and require immediate veterinary attention. Always monitor your pet for a few hours after any vaccination visit.
How Vaccination Schedules Typically Work
Vaccination schedules are not one-size-fits-all. Schedules are shaped by the pet's age, prior vaccine history, health status, and local disease prevalence. Here's a general overview:
~50,000
Annual human rabies deaths worldwide
According to the World Health Organization, rabies kills an estimated 59,000 people globally each year — vaccination of dogs is key to elimination efforts.
Up to 91%
Fatality rate of untreated parvovirus in dogs
Canine parvovirus can be fatal in the vast majority of untreated cases; vaccination has dramatically reduced its prevalence in dogs.
3–4 weeks
Interval between puppy vaccine series doses
AAHA guidelines recommend spacing puppy booster doses 3–4 weeks apart to account for the gradual decline of maternal antibodies.
Puppies and Kittens
Young animals receive a primary vaccine series, usually starting at 6–8 weeks of age, with boosters every 3–4 weeks until about 16 weeks. This series is necessary because maternal antibodies from the mother can interfere with early vaccines — the series ensures at least one dose takes full effect after those antibodies fade.
Adult Pets
After the initial series, most core vaccines are boostered at 1 year, then on 1- or 3-year cycles depending on the vaccine type and formulation. Non-core vaccines often require annual boosters, especially for diseases like Bordetella and canine influenza.
Senior Pets
Older pets may need adjusted schedules based on immune function and overall health. Your vet may run titer tests — blood tests measuring existing antibody levels — to determine whether a booster is actually needed, rather than vaccinating on a fixed schedule.
Keeping accurate records matters. Make vaccination tracking part of your routine with a comprehensive pet care checklist. And remember, vaccines are just one piece of what a routine wellness exam covers.
This article is for general educational purposes only and does not constitute veterinary medical advice. Always consult a licensed veterinarian for guidance specific to your pet's health, history, and local disease risks.