The Complete Dog Vaccination Schedule: Core vs. Non-Core Vaccines (2026)

Vaccinations protect your dog from highly contagious and potentially fatal diseases. However, understanding exactly which vaccines your dog needs, and how often they need them, can be confusing.

The American Animal Hospital Association (AAHA) guidelines divide dog vaccines into two categories: Core (recommended for all dogs) and Non-Core or Lifestyle (recommended based on geography and lifestyle).

Core Vaccines (Every Dog Needs These)

For more on this topic, see our guide on The Complete Guide to Dog Vaccinations (2026).

Core vaccines protect against diseases that are widely distributed, highly contagious, and severe or fatal.

1. Rabies

Rabies is a fatal viral disease that attacks the central nervous system. Because it is zoonotic (can be transmitted to humans, usually via a bite) and virtually 100% fatal once symptoms appear, Rabies vaccination is required by law in almost all states.

• Puppy Schedule: One dose given between 12 and 16 weeks of age.
• Adult Booster: A booster is required 1 year after the initial puppy vaccine. Thereafter, it is typically given every 1 or 3 years, depending on local laws and the specific vaccine used.

For more on this topic, see our guide on When to See a Vet: 12 Symptoms Dog Owners Shouldn’t Ignore (2026).

2. DAPP (or DHPP) Combination Vaccine

This is a combination shot that protects against four distinct diseases:

• Distemper (D): A highly contagious viral disease affecting the respiratory, gastrointestinal, and nervous systems. Often fatal in puppies.

• Adenovirus/Hepatitis (A/H): A viral disease that targets the liver.

• Parainfluenza (P): A highly contagious respiratory virus (one of the causes of kennel cough).

• Parvovirus (P): A notoriously hardy, highly contagious virus that attacks the gastrointestinal tract, causing severe vomiting, bloody diarrhea, and rapid dehydration. Highly fatal if untreated.

• Puppy Schedule: Given in a series starting at 6-8 weeks of age, with boosters every 3-4 weeks until the puppy is 16 weeks old. (If a puppy receives only one dose at 12 weeks, they are not fully protected until the 16-week booster).

• Adult Booster: A booster is given 1 year after the final puppy shot, then typically every 3 years thereafter.

Non-Core (Lifestyle) Vaccines

These vaccines are not required for every dog. Your veterinarian will recommend them based on where you live, where you travel, and what your dog does (e.g., boarding, hiking, dog parks).

1. Bordetella (Kennel Cough)

Protects against Bordetella bronchiseptica, the most common bacterial cause of kennel cough.

• Who needs it: Dogs that frequent dog parks, daycare, boarding facilities, grooming salons, or training classes. Most boarding facilities require it.
• Schedule: Often given as an intranasal drop or oral liquid. Typically boosted every 6 to 12 months depending on exposure risk.

2. Leptospirosis

Leptospirosis is a bacterial disease transmitted through the urine of infected wildlife (rats, raccoons, deer) that contaminates standing water or soil. It can cause acute kidney or liver failure and is zoonotic (transmissible to humans).

• Who needs it: Dogs that hike, swim in lakes/streams, or live in areas with significant wildlife populations (even urban environments with high rat populations).
• Schedule: An initial two-dose series (2-4 weeks apart), followed by an annual booster.

3. Lyme Disease

Transmitted by the bite of an infected deer tick. It can cause joint pain, fever, and in severe cases, kidney damage.

• Who needs it: Dogs living in or traveling to areas where Lyme disease is endemic (Northeast, Mid-Atlantic, Upper Midwest US) and who spend time in wooded or tall grass areas.
• Schedule: An initial two-dose series (2-4 weeks apart), followed by an annual booster prior to the start of tick season. Note: Tick prevention medication remains the primary defense against Lyme disease.

4. Canine Influenza (Dog Flu)

A highly contagious respiratory infection.

• Who needs it: Similar risk profile to Bordetella (dogs frequently exposed to many other dogs), especially in regions experiencing an outbreak.
• Schedule: An initial two-dose series, followed by an annual booster.

Typical Puppy Vaccination Schedule Summary

Age	Core Vaccines	Potential Non-Core
6-8 weeks	DAPP (Shot 1)	Bordetella
10-12 weeks	DAPP (Shot 2)	Leptospirosis (Shot 1), Lyme (Shot 1), Influenza (Shot 1)
14-16 weeks	DAPP (Shot 3), Rabies	Leptospirosis (Shot 2), Lyme (Shot 2), Influenza (Shot 2)

Note: You should wait 1-2 weeks after the 16-week shots before taking your puppy to high-risk areas like dog parks or pet stores.

The Titer Testing Alternative

If you are concerned about over-vaccinating your adult dog, you can ask your veterinarian for a titer test instead of automatically giving the 3-year DAPP booster.

A titer test is a blood test that measures the level of antibodies in the dog’s blood for specific diseases (like Parvo and Distemper). If the antibody levels are high enough, it indicates the dog still has immunity from past vaccines and does not need a booster that year.

Important: Titer testing is not accepted in lieu of a Rabies vaccine for legal requirements. You must still get the Rabies shot according to local laws.

Vaccine Reactions

Vaccine reactions in dogs are relatively uncommon but can occur.

• Normal, mild reactions: Mild lethargy, slight fever, decreased appetite, or a small, painless lump at the injection site for 24-48 hours.
• Severe reactions (seek immediate veterinary care): Facial swelling, hives, vomiting, diarrhea, difficulty breathing, or collapse. These typically occur within minutes to hours after vaccination.