| First puppy vaccine age | 6–8 weeks (AAHA Canine Vaccination Guidelines) |
| Core vaccines required | Rabies, Distemper, Parvovirus, Adenovirus (American Animal Hospital Association (AAHA)) |
| DHPP adult booster interval | Every 3 years (after initial adult booster) (AAHA Canine Vaccination Guidelines) |
| Rabies booster frequency | Every 1–3 years (varies by state law and product) (State-level regulatory requirements vary) |
| Bordetella booster interval | Typically annual or every 6 months for high-risk dogs (AAHA Canine Vaccination Guidelines) |
| Puppy series doses (DHPP) | 3 doses, spaced 3–4 weeks apart (AAHA Canine Vaccination Guidelines) |
Core vs. Non-Core Vaccines: What the Distinction Means
Dog vaccines fall into two categories: core and non-core. Core vaccines are recommended for virtually every dog regardless of lifestyle, because the diseases they prevent are either widespread, severe, or pose a risk to human health. Non-core vaccines are given based on individual risk factors such as geographic location, living situation, and activity level.
Core vaccine
A vaccine recommended for all dogs regardless of lifestyle because the disease it targets is widespread, severe, or transmissible to humans. Examples include rabies and parvovirus.
Non-core vaccine
A vaccine given based on a dog's individual risk factors such as geographic location, exposure to other animals, or outdoor activity. Lyme disease and Bordetella are common examples.
DHPP
A combination vaccine protecting against Distemper, Hepatitis (Adenovirus), Parvovirus, and Parainfluenza. It is the most commonly administered multi-disease vaccine in the puppy series.
Titer test
A blood test that measures the level of antibodies a dog has against a specific disease, used to assess existing immunity before deciding whether a booster is needed.
Maternal antibodies
Protective antibodies passed from a mother dog to her puppies through colostrum. They provide early immunity but gradually decline, which is why staggered puppy vaccines are necessary.
Booster
A follow-up dose of a vaccine given after the initial series to maintain or renew a dog's immune protection over time.
Core vaccines in the United States typically include:
- Rabies — legally required in most states; protects dogs and people from a uniformly fatal viral disease.
- Distemper — a serious viral illness affecting the respiratory, gastrointestinal, and nervous systems.
- Parvovirus — a highly contagious and potentially fatal gastrointestinal disease, especially dangerous in puppies.
- Adenovirus (Hepatitis) — protects against infectious canine hepatitis.
These four are often delivered together in a combination shot commonly called the DHPP vaccine (distemper, hepatitis, parvovirus, parainfluenza).
Non-core vaccines your veterinarian may recommend include Bordetella (kennel cough), Leptospirosis, Lyme disease, and Canine Influenza. Dogs that frequent dog parks, boarding facilities, or wooded tick-prone areas are stronger candidates for several of these. See our guide on indoor vs. outdoor dogs for context on how lifestyle shapes these decisions.
The Puppy Vaccination Timeline
Puppies receive a series of vaccines starting at around 6–8 weeks of age. The series is staggered because maternal antibodies — passed from mother to pup through colostrum — gradually wane and can interfere with vaccine effectiveness. Giving multiple doses at intervals ensures protection builds reliably as those maternal antibodies decline.
| First puppy vaccine age | 6–8 weeks (AAHA Canine Vaccination Guidelines) |
| Core vaccines required | Rabies, Distemper, Parvovirus, Adenovirus (American Animal Hospital Association (AAHA)) |
| DHPP adult booster interval | Every 3 years (after initial adult booster) (AAHA Canine Vaccination Guidelines) |
| Rabies booster frequency | Every 1–3 years (varies by state law and product) (State-level regulatory requirements vary) |
| Bordetella booster interval | Typically annual or every 6 months for high-risk dogs (AAHA Canine Vaccination Guidelines) |
| Puppy series doses (DHPP) | 3 doses, spaced 3–4 weeks apart (AAHA Canine Vaccination Guidelines) |
A typical puppy schedule looks like this:
| Age | Vaccines Typically Given |
|---|---|
| 6–8 weeks | DHPP (first dose), optional Bordetella |
| 10–12 weeks | DHPP (second dose), Leptospirosis (if recommended), optional Lyme |
| 14–16 weeks | DHPP (third dose), Rabies, Leptospirosis booster |
| 12–16 months | DHPP booster, Rabies booster, any non-core follow-ups |
Timing can vary slightly by veterinarian protocol and the specific vaccine product used. If you're bringing home a new puppy, our first-dog guide covers what to expect in those early weeks, including navigating the socialization window alongside vaccination restrictions.
It's worth noting that incomplete puppy series leave dogs vulnerable. Missing even one dose in the series — or spacing doses incorrectly — can significantly reduce protection, particularly against parvovirus.
Adult Dog Boosters and Titer Testing
Once the puppy series is complete, most core vaccines shift to a booster schedule. Rabies vaccine intervals are set by state law — typically every one or three years depending on the product used and local regulations. The DHPP combination is generally boostered one year after the final puppy dose, then every three years for most adult dogs under current American Animal Hospital Association (AAHA) guidelines.
Non-core vaccines like Bordetella and Leptospirosis often require annual boosters because protection from those vaccines wanes faster.
Understanding Titer Tests and Their Limits
Titer testing measures circulating antibody levels but doesn't capture full immune memory, meaning a dog with a low titer may still have meaningful protection. Conversely, a high titer doesn't guarantee immunity to every strain. Titer results are one data point, not a definitive pass-or-fail immunity verdict — your veterinarian is best positioned to interpret them in context. Rabies titer tests also do not legally replace rabies vaccination in most U.S. jurisdictions.
Titer testing is an alternative some owners and veterinarians use to assess whether a dog still has adequate immunity from a previous vaccine before automatically re-vaccinating. A blood titer measures the concentration of antibodies against specific diseases. While titer testing is a legitimate tool, it doesn't replace rabies vaccination where legally mandated, and results can be nuanced — always discuss findings with your veterinarian.
Keeping organized records is essential. Before any vet visit, review what documents and information to bring so your veterinarian can accurately assess your dog's vaccination history and due dates.
Common Questions and Practical Considerations
Can vaccines cause side effects? Mild, short-lived reactions — slight soreness at the injection site, low-grade lethargy, or reduced appetite for a day — are common and generally not concerning. Rarely, dogs can have a more significant allergic reaction. Signs such as facial swelling, vomiting, difficulty breathing, or collapse within hours of vaccination warrant immediate veterinary attention.
What if my dog missed a scheduled vaccine? Depending on how much time has passed, your veterinarian may restart a series or simply administer a booster. Dogs are not permanently unprotected after a gap, but the longer the delay, the more important it is to reassess immunity.
Are there dogs who shouldn't be vaccinated on the standard schedule? Yes. Dogs with certain immune conditions, those receiving immunosuppressive medications, or dogs in poor health may need a modified approach. This is a conversation for your veterinarian — never skip or modify a vaccine schedule based on general advice alone.
Preventive care goes well beyond vaccines. Dental health is one of the most commonly neglected areas of routine dog care and pairs naturally with a proactive wellness mindset.
This article provides general educational information about dog vaccines and is not a substitute for personalized veterinary advice. Always consult a licensed veterinarian to determine the appropriate vaccination schedule for your individual dog.