Last updated: April 27, 2026

Dog Vaccination Schedule: Core Vaccines, Puppy Shots & Boosters

Whether you have just brought home a new puppy or you are reviewing your adult dog’s health records, understanding the dog vaccination schedule is one of the most important things you can do as a responsible pet owner. Vaccines protect dogs from serious, often fatal diseases — and they protect the broader animal community by reducing the spread of contagious pathogens.

This guide walks you through every vaccine your dog may need, when they need it, what it costs, and how to make informed decisions with your veterinarian. If you are considering adopting a dog, knowing what vaccines to expect is a valuable part of preparing for your new companion.

Why Vaccines Matter for Dogs

Vaccines work by introducing a small, harmless piece of a virus or bacterium into your dog’s body, prompting the immune system to build defenses without causing the actual disease. When your dog later encounters the real pathogen, their immune system recognizes it and responds quickly — often preventing infection entirely or dramatically reducing its severity.

Before widespread canine vaccination programs, diseases like distemper and parvovirus killed thousands of dogs every year. Rabies, which is nearly always fatal once symptoms appear, posed a serious public health risk to humans as well. Vaccination has changed that picture dramatically, but these diseases have not disappeared. They persist in wildlife populations and in unvaccinated domestic animals, which means that keeping your dog’s vaccines current remains essential.

Vaccines also matter at a community level. When a high percentage of dogs in a region are vaccinated, the chances of an outbreak drop sharply — a concept known as herd immunity. Every vaccinated dog contributes to the safety of puppies too young for their full series, senior dogs with weakened immune systems, and immunocompromised animals who cannot be vaccinated at all.

Core Vaccines for Dogs

Core vaccines are those recommended for every dog regardless of lifestyle, location, or breed. They protect against diseases that are widespread, highly contagious, or pose a serious risk to both animal and human health. Your veterinarian will include all four of these in a standard dog vaccination schedule.

Canine Distemper Virus (CDV)

Distemper is a highly contagious viral disease that attacks a dog’s respiratory, gastrointestinal, and nervous systems. It spreads through airborne exposure — coughing, sneezing, and shared food or water bowls — and can also be transmitted by wildlife such as raccoons, foxes, and skunks. Early symptoms include fever, nasal discharge, coughing, and lethargy. As the disease progresses, it can cause seizures, paralysis, and brain damage. The mortality rate in unvaccinated puppies can exceed fifty percent, and dogs that survive often suffer permanent neurological damage. There is no antiviral treatment for distemper, which makes vaccination the only reliable protection.

Canine Parvovirus (CPV)

Parvovirus is one of the most feared diseases among dog owners, and for good reason. It primarily attacks the lining of the small intestine, causing severe vomiting, bloody diarrhea, dehydration, and rapid weight loss. In puppies under four months old, parvo can also damage the heart muscle. The virus is extraordinarily hardy — it can survive in soil and on surfaces for months or even years — and it spreads through direct contact with infected dogs or contaminated environments. Without aggressive veterinary treatment, the fatality rate in unvaccinated dogs can reach ninety percent. Treatment is supportive rather than curative and often requires days of hospitalization with intravenous fluids. Vaccination is remarkably effective at prevention.

Canine Adenovirus (Hepatitis)

Canine adenovirus type 2 (CAV-2) is used in vaccines to protect against both canine adenovirus type 1, which causes infectious canine hepatitis, and type 2, which contributes to respiratory illness. Infectious hepatitis attacks the liver, kidneys, and blood vessel lining, and severe cases can be fatal within hours of the first symptoms. Milder cases may present as fever, loss of appetite, and a cloudy appearance in the eyes sometimes called “blue eye.” The CAV-2 vaccine provides cross-protection against both strains and is typically combined with distemper and parvovirus in a single injection known as the DHPP or DA2PP combination vaccine.

Rabies

Rabies is unique among canine vaccines because it is required by law in virtually every jurisdiction in the United States and many countries worldwide. The rabies virus attacks the central nervous system and is almost always fatal once clinical signs appear — in dogs and in humans. It is transmitted through the bite of an infected animal, and because it is a zoonotic disease, meaning it can pass from animals to people, public health authorities take rabies prevention extremely seriously. Puppies typically receive their first rabies vaccine between twelve and sixteen weeks of age, with a booster at one year and subsequent boosters every one to three years depending on the vaccine formulation and local regulations.

Non-Core Vaccines for Dogs

Non-core vaccines are recommended based on a dog’s specific risk factors — where they live, how much time they spend outdoors, whether they visit boarding facilities or dog parks, and what diseases are prevalent in their region. Your veterinarian will help you determine which of these belong in your dog’s individual dog vaccination schedule.

Bordetella Bronchiseptica (Kennel Cough)

Bordetella is one of the primary bacterial agents behind kennel cough, a highly contagious respiratory infection that causes a persistent, dry, hacking cough. While kennel cough is rarely life-threatening in healthy adult dogs, it can be serious in puppies, senior dogs, and dogs with compromised immune systems. The bordetella vaccine is available as an injection, an intranasal spray, or an oral formulation. Most boarding facilities, groomers, and doggy daycares require proof of bordetella vaccination, so if your dog spends time in group settings, this vaccine is effectively essential. It is typically given annually, though some facilities require it every six months.

Leptospirosis

Leptospirosis is a bacterial infection spread through the urine of infected animals, including wildlife such as rats, raccoons, and deer. Dogs can contract it by drinking from or wading through contaminated water sources — puddles, ponds, streams — or by coming into contact with contaminated soil. Leptospirosis can cause kidney failure, liver damage, and in severe cases, death. It is also zoonotic, meaning infected dogs can transmit it to humans. The vaccine is particularly recommended for dogs in rural areas, dogs that spend time near bodies of water, and dogs in regions where leptospirosis cases have been reported. The initial series requires two doses given two to four weeks apart, followed by annual boosters.

Lyme Disease (Borrelia burgdorferi)

Lyme disease is transmitted through the bite of infected black-legged ticks and is most prevalent in the northeastern United States, the upper Midwest, and along the Pacific coast. In dogs, Lyme disease can cause lameness, joint swelling, fever, loss of appetite, and in serious cases, kidney damage. The Lyme vaccine is recommended for dogs that live in or travel to endemic areas. It requires an initial two-dose series followed by annual boosters. Tick prevention measures — topical treatments, oral preventatives, and regular tick checks — should be used alongside vaccination for the best protection.

Canine Influenza (H3N2 and H3N8)

Canine influenza is a relatively newer concern, with the H3N8 strain first identified in dogs in 2004 and the H3N2 strain emerging in the United States in 2015. Both strains cause respiratory illness with symptoms similar to kennel cough — coughing, sneezing, nasal discharge, fever, and lethargy. While most dogs recover with supportive care, some develop pneumonia, which can be serious or fatal. The canine influenza vaccine covers both strains and is recommended for dogs that frequent boarding facilities, dog parks, shows, and other environments where dogs congregate. Like the leptospirosis vaccine, the initial series requires two doses given two to four weeks apart, followed by annual boosters.

Puppy Vaccination Schedule by Age

Puppies are born with some immunity passed from their mother through colostrum, but this maternal immunity fades over the first few months of life. The puppy vaccination series is designed to build active immunity as maternal protection wanes. Because the exact timing of that transition varies from puppy to puppy, vaccines are given in a series of boosters to ensure protection is established. Below is a typical dog vaccination schedule for puppies.

6 to 8 weeks: First DHPP combination vaccine (distemper, adenovirus/hepatitis, parainfluenza, parvovirus). Some veterinarians also begin the bordetella vaccine at this age if the puppy will be in group settings.

10 to 12 weeks: Second DHPP booster. Leptospirosis first dose if indicated by risk factors. Lyme disease first dose if in an endemic area. Canine influenza first dose if lifestyle warrants it.

12 to 16 weeks: First rabies vaccine (required by law in most jurisdictions). Third DHPP booster. Leptospirosis second dose. Lyme disease second dose. Canine influenza second dose. Bordetella booster if the initial dose was given earlier.

16 to 18 weeks: Final DHPP booster in the puppy series. This last dose is critical — it ensures that the vaccine takes hold even in puppies whose maternal antibodies persisted longer than average. Skipping this final booster leaves a puppy potentially vulnerable during a dangerous window.

Until a puppy has completed their full vaccination series, it is wise to limit their exposure to environments where unvaccinated dogs may have been — dog parks, pet stores, and heavily trafficked sidewalks. Socialization remains important during this period, but it should be managed carefully. Puppy socialization classes held in sanitized environments with other vaccinated puppies are a good compromise. If you are looking to bring a puppy into your home, our adoption page can help you find a dog that has already started their vaccination series.

Adult Dog Booster Schedule

Once a dog has completed their puppy series and received their one-year boosters, the frequency of subsequent vaccinations shifts. Here is what the ongoing dog vaccination schedule looks like for adult dogs.

DHPP: After the one-year booster, the DHPP combination vaccine is typically given every three years. Research has shown that the core components of this vaccine provide robust immunity lasting at least three years in most dogs, and many veterinary organizations have updated their guidelines accordingly.

Rabies: The first rabies booster is due one year after the initial puppy dose. After that, boosters are given every one to three years depending on the vaccine product used and local legal requirements. Some jurisdictions require annual rabies vaccination regardless of the vaccine’s labeled duration of immunity.

Bordetella: Annually, or every six months for dogs that are frequently boarded or attend daycare.

Leptospirosis: Annually, for dogs with ongoing risk factors.

Lyme disease: Annually, for dogs in endemic tick areas.

Canine influenza: Annually, for dogs in high-exposure environments.

Your veterinarian will tailor this schedule to your dog’s specific needs. A dog that spends most of their time at home in a low-risk area will have a different schedule than a dog that regularly visits dog parks, travels, or lives in a region with high wildlife contact. Checking the breed-specific health tendencies for your dog can also help inform these conversations — our dog breeds directory is a helpful starting point.

Potential Side Effects of Dog Vaccines

Most dogs tolerate vaccines well, but mild side effects are not uncommon and usually resolve within a day or two. Knowing what to expect — and what to watch for — helps you respond calmly and appropriately.

Common, mild side effects include soreness or slight swelling at the injection site, mild lethargy or decreased appetite for twelve to twenty-four hours, a low-grade fever, and occasional sneezing or mild nasal discharge after intranasal vaccines. These reactions are normal signs that the immune system is responding to the vaccine and do not require veterinary intervention unless they persist beyond forty-eight hours.

Less common but more serious reactions include persistent vomiting or diarrhea, facial swelling or hives, difficulty breathing, collapse, or a significant lump at the injection site that does not resolve within a few weeks. These reactions require prompt veterinary attention. Anaphylaxis — a severe, life-threatening allergic reaction — is rare but can occur within minutes to hours of vaccination.

Small-breed dogs appear to have a slightly higher rate of vaccine reactions than larger dogs, possibly because they receive the same vaccine dose relative to a much smaller body mass. If your small dog has had a reaction in the past, your veterinarian may recommend pre-treatment with antihistamines, spacing vaccines out over multiple visits, or adjusting the vaccination protocol.

How Much Do Dog Vaccines Cost?

Vaccine costs vary by region, clinic type, and which vaccines are given, but understanding the general range helps with budgeting.

DHPP combination vaccine: Typically fifteen to thirty dollars per dose. With three to four doses in the puppy series, the total for the first year runs between sixty and one hundred twenty dollars.

Rabies vaccine: Usually fifteen to twenty-five dollars per dose. Some local animal control agencies or nonprofit clinics offer low-cost rabies vaccination events where the cost may be as low as five to ten dollars.

Bordetella: Twenty to forty-five dollars per dose, depending on the formulation (injectable, intranasal, or oral).

Leptospirosis: Twenty to thirty-five dollars per dose, with two doses needed for the initial series.

Lyme disease: Twenty-five to forty dollars per dose, with two initial doses required.

Canine influenza: Twenty-five to fifty dollars per dose, with two initial doses required.

Many veterinary clinics offer puppy wellness packages that bundle the full puppy vaccination series with deworming, a fecal exam, and sometimes a spay or neuter discount. These packages often cost less than paying for each service individually and can bring the first-year vaccination total to between one hundred fifty and three hundred dollars for core vaccines. Low-cost vaccination clinics, often run by humane societies or animal welfare organizations, are another option for pet owners on a budget. When you adopt through a rescue, many of these initial vaccines are already covered in the adoption fee.

Titer Testing: An Alternative to Automatic Boosters

Titer testing is a blood test that measures the level of antibodies your dog has against specific diseases. Instead of automatically revaccinating on a set schedule, a titer test can tell you whether your dog still has adequate immunity from previous vaccinations. If antibody levels are sufficient, the booster can be deferred.

Titer testing is most commonly used for the core vaccines — distemper, parvovirus, and adenovirus. It is not a substitute for rabies vaccination, which is legally required regardless of titer results in most jurisdictions.

There are good reasons to consider titer testing. Dogs that have had vaccine reactions may benefit from avoiding unnecessary boosters. Senior dogs and dogs with chronic illnesses may be better served by testing rather than automatic revaccination. Some pet owners simply prefer a data-driven approach to their dog’s healthcare.

The cost of a titer test typically runs between forty and two hundred dollars depending on the laboratory and how many diseases are tested. That is more expensive than a single vaccine dose, which is the main reason titer testing has not replaced routine boosters for most dogs. However, for dogs with specific medical concerns or histories of adverse reactions, the additional cost provides valuable information. Discuss the option with your veterinarian to decide whether titer testing makes sense for your dog’s individual situation.

Frequently Asked Questions

What happens if my dog misses a booster vaccine?

If your dog misses a scheduled booster by a few weeks, contact your veterinarian promptly to get back on track. In many cases, a single booster will be sufficient to restore immunity. If a significant amount of time has passed — several months or more — your veterinarian may recommend restarting the series with two doses given a few weeks apart, particularly for non-core vaccines like leptospirosis and Lyme disease. For core vaccines, research suggests that immunity often lasts longer than the minimum recommended interval, but it is always better to stay current than to guess.

Can I vaccinate my dog at home?

Some vaccines, such as the DHPP combination, are available for purchase at farm supply stores and can technically be administered at home. However, there are important reasons to have vaccines given by a veterinarian. A vet ensures proper storage, handling, and injection technique. They can respond immediately if a reaction occurs. And critically, most jurisdictions require that rabies vaccines be administered by a licensed veterinarian for the vaccination to be legally valid. Home-administered vaccines also may not be recognized by boarding facilities or groomers.

Are there risks to over-vaccinating my dog?

Unnecessary vaccination carries a small but real risk of adverse reactions, and there is growing consensus in veterinary medicine that less frequent boosting — guided by current evidence and titer testing when appropriate — is preferable to annual revaccination across the board. The shift from annual to triennial core boosters reflects this understanding. Your veterinarian can help you find the right balance between adequate protection and minimal unnecessary risk.

Do small dogs and large dogs follow the same vaccination schedule?

Yes, the vaccination schedule is the same regardless of a dog’s size. Unlike many medications, vaccines are not dosed by weight — a Chihuahua receives the same vaccine dose as a Great Dane. The immune response triggered by a vaccine does not depend on body mass in the same way that drug metabolism does. However, as noted above, small dogs may have a slightly higher rate of mild side effects, so your veterinarian may recommend spacing vaccines across multiple visits for smaller breeds.

How do I know which non-core vaccines my dog needs?

The best approach is an honest conversation with your veterinarian about your dog’s lifestyle. Key factors include whether your dog attends daycare, boarding, or group training; whether they spend time in wooded or rural areas where ticks are common; whether they swim in or drink from natural water sources; and whether canine influenza or leptospirosis outbreaks have been reported in your area. Your vet can then recommend a tailored dog vaccination schedule that covers the real risks your dog faces without unnecessary extras. Browsing our dog breeds directory can also help you understand breed-specific health considerations that may influence vaccine decisions.