Every dog needs a small set of core vaccines: rabies, distemper, parvovirus, and adenovirus. Most veterinarians now also recommend leptospirosis for all dogs. Beyond those, your dog may need additional vaccines depending on lifestyle, location, and how much time they spend around other dogs.
Core Vaccines Every Dog Needs
Core vaccines protect against diseases that are widespread, highly contagious, and often fatal. They’re recommended for all dogs regardless of where they live or how they spend their time.
- Rabies: The only vaccine required by law in all 50 states. Rabies is nearly always fatal once symptoms appear, and it can spread to humans. Most states require the first dose by three months of age, a booster one year later, and revaccination every three years after that.
- Canine distemper virus: Attacks the respiratory, digestive, and nervous systems. There is no cure, and it kills a large percentage of infected dogs.
- Canine parvovirus: Causes severe, bloody diarrhea and dehydration, especially in puppies. Parvo is extremely hardy in the environment and can survive on surfaces for months.
- Canine adenovirus (hepatitis): Causes liver inflammation and can be fatal. The vaccine also provides some cross-protection against a form of adenovirus that contributes to kennel cough.
- Leptospirosis: A bacterial infection spread through contaminated water, soil, or wildlife urine. It can damage the liver and kidneys and is one of the few dog diseases that can also infect humans. Veterinary guidelines now classify this as a core vaccine because the disease can occur even in urban environments.
Distemper, adenovirus, parvovirus, and parainfluenza are typically bundled into a single combination shot called DHPP (sometimes labeled DAPP or DA2PP). Your vet records may list it by any of those abbreviations. None of the viruses it covers have a cure, which is why prevention through vaccination is so important.
Non-Core Vaccines Based on Lifestyle
Non-core vaccines are recommended selectively. Your vet will consider factors like geography, tick exposure, and how often your dog is around other dogs.
- Bordetella (kennel cough): Protects against a highly contagious respiratory infection. Most boarding facilities, groomers, doggy daycares, and training classes require this vaccine before they’ll accept your dog. If your dog regularly visits dog parks or interacts with unfamiliar dogs, it’s worth getting.
- Lyme disease: Spread by ticks, Lyme disease causes joint pain, fever, and can lead to kidney damage. Dogs in the Northeast, upper Midwest, and other areas with heavy tick populations benefit most from this vaccine.
- Canine influenza: Dog flu spreads quickly in high-density environments like shelters, boarding facilities, and dog shows. Some boarding kennels now require it alongside Bordetella.
Your vet can help you decide which of these makes sense. A dog that rarely leaves the yard has different needs than one that hikes through wooded trails or spends weekends at daycare.
Puppy Vaccination Schedule
Puppies receive their mother’s antibodies through nursing, but that protection fades during the first few months of life. To bridge the gap, puppies get a series of shots rather than a single dose. The core combination vaccine (DHPP) is typically given in a series of three rounds: at roughly 6 to 8 weeks, 12 weeks, and 16 weeks of age. The reason for multiple doses isn’t that one shot is too weak. It’s that maternal antibodies can interfere with the vaccine’s effectiveness, and there’s no way to know exactly when those antibodies drop low enough for the vaccine to take hold. Giving multiple doses at intervals ensures the puppy develops its own immunity.
Rabies is usually given as a single dose around 12 to 16 weeks, with a booster one year later. After that, most states accept a three-year rabies vaccine. Some states specifically prohibit the use of one-year rabies vaccines in dogs and require the three-year version.
Until a puppy has completed the full series, they’re still vulnerable. Most vets recommend limiting exposure to unknown dogs and avoiding places like dog parks until about two weeks after the final round of shots.
Adult Booster Schedule
After the puppy series, adult dogs need periodic boosters to maintain protection. The DHPP combination vaccine is typically boosted one year after the puppy series, then every three years. Rabies follows a similar pattern: one year after the initial dose, then every three years. Leptospirosis requires annual boosters because immunity from the vaccine fades more quickly.
Non-core vaccines like Bordetella and canine influenza also tend to need annual boosters. Your vet’s reminders will reflect whatever combination your dog receives.
Titer Testing as an Alternative
If you’d rather not revaccinate an adult dog on a fixed schedule, titer testing is an option for some vaccines. A titer test measures the level of antibodies in your dog’s blood. A high enough level suggests the dog still has protective immunity and doesn’t need a booster yet.
According to veterinary guidelines from the AAHA, titer testing is useful for monitoring immunity to distemper, parvovirus, adenovirus, and rabies. Some dog owners use titers for distemper and parvovirus in place of routine revaccination. The test involves a simple blood draw, and results can come from either an in-clinic rapid test or a full lab analysis.
There are limitations. A low titer doesn’t necessarily mean your dog is unprotected, because immune memory can exist even when circulating antibodies are low. And titer tests don’t work the same way for every disease. For leptospirosis, a positive titer can indicate active infection rather than immunity, making it unreliable as a substitute for vaccination. Rabies titers are accepted by some jurisdictions for travel purposes but generally don’t replace the legally mandated vaccine.
Common Side Effects
Most dogs handle vaccines with nothing more than a quiet afternoon. Mild side effects include low energy, slight fever, and reduced appetite for a day or two. Some dogs develop a small, firm swelling at the injection site that can last up to a week. Pain or stinging at the time of injection is usually caused by preservatives or the temperature of the vaccine rather than the vaccine itself.
Allergic reactions are uncommon but can happen within minutes to a few hours after vaccination. In dogs, the most typical signs are facial swelling, hives around the head and ears, or vomiting. Respiratory distress is rare but serious. If your dog’s face begins to swell or they seem to have difficulty breathing after a vaccination, that warrants an immediate trip back to the vet. Dogs that have reacted before can often be pre-treated with antihistamines at future visits.
Keeping Costs Manageable
The puppy series is the most expensive stretch because it involves multiple visits over several months. After that first year, costs drop to annual or triennial boosters. Low-cost vaccination clinics run by animal shelters, humane societies, and mobile vet services can significantly reduce the price. Some cities, like Seattle, offer entirely free vaccination clinics through their municipal animal shelters, providing core vaccines, deworming, flea treatment, and microchipping at no charge. Checking with your local shelter or searching for low-cost clinics in your area is one of the simplest ways to keep your dog current without overspending.