The Complete Pet Vaccine Schedule for Dogs and Cats (2026 Update)

Why Vaccines Still Matter

Vaccines are the highest-leverage thing you can do for your pet's lifetime health. The diseases vaccines prevent — distemper, parvo, rabies, panleukopenia, leptospirosis — are not gone. They are kept rare specifically because most pets get vaccinated. Each year U.S. shelters still treat outbreaks of canine distemper and feline panleukopenia, and rabies cases in domestic animals continue to be reported across every region of the country.

The U.S. veterinary community sets vaccine recommendations through two main bodies: the American Animal Hospital Association (AAHA) for dogs, and the AAHA/AAFP joint guidelines for cats. These are the standards your vet works from. The 2022 canine guidelines received a major update in 2024 — most importantly, leptospirosis was reclassified from non-core to core for most dogs.

This guide covers the full schedule, what each vaccine protects against, and when boosters are due.

Core vs. Non-Core Vaccines

Vaccines fall into two categories:

• Core vaccines are recommended for every pet, regardless of lifestyle. They protect against diseases that are widespread, severe, or transmissible to humans.
• Non-core (sometimes called lifestyle) vaccines are recommended based on individual risk: where you live, where your pet goes (boarding, daycare, dog parks, hiking trails), and exposure to other animals.

Whether a non-core vaccine is right for your pet is a conversation with your veterinarian. Some — like Bordetella — are required by most boarding facilities and daycares. Others — like the Lyme vaccine — depend heavily on geography.

Dog Vaccine Schedule

Core Vaccines for Dogs

• DHPP/DAPP — Distemper, Adenovirus type 2 (which also covers hepatitis), Parvovirus, and Parainfluenza.
• Rabies — Required by law in nearly every U.S. state.
• Leptospirosis — Reclassified as core in the 2024 AAHA guideline update. Leptospirosis is a bacterial infection contracted from contaminated water and wildlife urine, and it is transmissible to humans.

Non-Core Vaccines for Dogs

• Bordetella (kennel cough) — required by most boarding kennels and daycares.
• Canine influenza (H3N2/H3N8) — recommended for dogs that travel, board, or attend daycare.
• Lyme disease — recommended for dogs in tick-endemic regions, especially the Northeast, upper Midwest, and parts of California.
• Western diamondback rattlesnake toxoid — for dogs in the Southwest.

Puppy Schedule (6 weeks - 16 weeks)

The leptospirosis schedule deserves attention. The 2024 update specifically recommends starting at 12 weeks or older — earlier vaccination carried higher reaction risk in small puppies. Your vet may delay it to the 14- or 16-week visit if your puppy is small or sensitive.

Adult Dog Schedule

Some clinics now use blood titer testing to confirm immunity for DHPP/DAPP rather than automatic re-vaccination. Discuss with your vet if this interests you — titer is more expensive per test but appropriate for some adult dogs with vaccine-sensitivity histories.

Cat Vaccine Schedule

Core Vaccines for Cats

• FVRCP — Feline Viral Rhinotracheitis (FHV-1), Calicivirus (FCV), and Panleukopenia (FPV). The combination shot every cat receives.
• Rabies — Core in all states; required by law in most.
• FeLV (Feline Leukemia Virus) — Core for all kittens up to 1 year of age. Becomes non-core for adult cats based on outdoor exposure.

Non-Core Vaccines for Cats

• FeLV in adult cats — recommended for cats with exposure to other cats outdoors or in multi-cat homes with FeLV-positive cats.
• Chlamydia felis — for cats in shelters or multi-cat households with confirmed exposure.
• Bordetella bronchiseptica — rare; mostly for shelter or breeding-colony cats.

Kitten Schedule (6 weeks - 6 months)

The 6-month FVRCP booster is a relatively recent addition to the AAHA/AAFP recommendations. It addresses the fact that some kittens still carry maternal antibodies that interfere with vaccine response at 16 weeks; a 6-month dose closes that window.

Adult Cat Schedule

Special Considerations

Indoor-Only Cats

An indoor-only cat still needs core vaccines. Rabies remains required by law in most states regardless of lifestyle, and FVRCP-preventable diseases can be brought home on shoes, clothing, or by other household pets.

Senior Pets

The 2023 AAHA Senior Care Guidelines do not generally recommend stopping vaccines based on age alone. Older pets with weakened immune systems are arguably at higher risk if exposed. Some seniors may benefit from titer testing rather than automatic boosters — that decision is between you and your vet.

Vaccine Reactions

Adverse reactions to vaccines are uncommon. The 2022 AAHA Canine Guidelines report fewer than 53 adverse events per 10,000 doses for canine vaccines. Most reactions are minor — soreness at the injection site, mild fever, fatigue for a day. Severe reactions (facial swelling, difficulty breathing, vomiting within hours) are rare but require immediate veterinary attention.

Pets who have had a vaccine reaction can usually still be vaccinated when needed, but with pre-medication and split scheduling. Your vet will work this out with you.

Adoption-Day Vaccines

If you adopt from a shelter, your pet has likely received their first round of core vaccines and possibly a rabies shot. Bring all paperwork to your first vet visit — a properly vaccinated shelter pet usually only needs to continue the schedule, not start over.

Cost Expectations

Individual vaccines typically run $15-$50 in the United States, with the puppy or kitten series totaling $75-$200 over the first six months. Many shelters issue vouchers for low-cost partner clinics that significantly reduce these costs. Pet wellness plans often bundle vaccines into a monthly fee.

Frequently Asked Questions

What if I missed a booster?

If your pet is overdue by a few weeks to a few months, your vet will usually pick up the schedule where you left off rather than starting over — most vaccines have a wide effective window. If your pet is more than a year overdue on the puppy or kitten series, they may need to restart with a two-dose primary protocol. Call your vet rather than guessing.

Are my shelter pet's vaccines really up to date?

Reputable shelters give core vaccines on intake and continue the puppy or kitten series before adoption. Bring all paperwork to your first vet visit so the schedule transitions cleanly. Pets adopted as adults usually only need a one-year booster of the core vaccines and a rabies shot to be fully covered going forward.

Can I split vaccines across multiple visits?

Yes. If your pet has had a reaction or is small and sensitive, vets often spread vaccines across two visits two to four weeks apart. There is no medical penalty for this approach beyond a second office visit fee.

Do I need vaccines if I'm traveling internationally?

Most countries require a current rabies vaccine and an international health certificate; some have specific timing rules (e.g., the rabies vaccine must be at least 21 days old). Check the destination country's import rules at least three months before travel. Hawaii, Guam, and the U.K. have especially strict requirements.

Do indoor cats really need rabies?

Yes — for two reasons. First, most U.S. states require it by law regardless of indoor status. Second, escapes happen, and unvaccinated pets exposed to rabies face mandatory long quarantines or, in some jurisdictions, euthanasia.

The Bottom Line

The vaccine schedule is one of the most established, well-evidenced, and high-impact parts of pet healthcare. Stick to your vet's plan, understand which vaccines apply to your specific pet's lifestyle and geography, and know that the small annual investment buys decades of protection against the most serious infectious diseases pets face.

This article is for informational purposes and is not veterinary advice. Always consult a licensed veterinarian about your pet's specific health concerns. In an emergency, call your vet or the ASPCA Animal Poison Control Center at (888) 426-4435.