Dog Vaccination Schedule: Core vs Non-Core Vaccines Explained

Core Vaccines: Required for Every Dog

Core vaccines protect against diseases that are widespread, highly contagious, and potentially fatal. The American Animal Hospital Association (AAHA) recommends these for all dogs regardless of lifestyle or location.

Rabies

Why it matters: Rabies is 100% fatal once symptoms appear and is transmissible to humans. Vaccination is required by law in all 50 U.S. states.

• First dose: 12-16 weeks of age
• Booster: 1 year after first dose, then every 1-3 years depending on state law and vaccine type

DHPP (Distemper, Hepatitis, Parainfluenza, Parvovirus)

This combination vaccine protects against four serious diseases. Parvovirus alone kills up to 91% of untreated puppies.

• Puppy series: Starting at 6-8 weeks, given every 3-4 weeks until 16 weeks of age (typically 3-4 doses)
• First booster: 1 year after the puppy series completion
• Subsequent boosters: Every 3 years for most adult dogs

Non-Core Vaccines: Based on Lifestyle and Risk

Non-core vaccines are recommended based on your dog's environment, travel habits, and exposure risk. Discuss your dog's specific situation with your veterinarian.

Bordetella (Kennel Cough)

• Recommended for: Dogs that visit boarding facilities, groomers, dog parks, or training classes
• Schedule: Can be given as early as 8 weeks; boosted annually or every 6 months for high-risk dogs
• Forms: Injectable, intranasal, or oral

Leptospirosis

• Recommended for: Dogs exposed to wildlife, standing water, or rural/suburban environments
• Schedule: Two doses 2-4 weeks apart starting at 12 weeks, then annual boosters
• Note: Increasingly considered core by many veterinarians due to rising incidence

Canine Influenza (H3N2 and H3N8)

• Recommended for: Dogs in social settings, shelters, or areas with outbreaks
• Schedule: Two doses 2-4 weeks apart, then annual boosters

Lyme Disease

• Recommended for: Dogs in tick-endemic regions (Northeast, Upper Midwest, Pacific Coast)
• Schedule: Two doses 2-4 weeks apart starting at 12 weeks, annual booster

Puppy Vaccination Series: The Critical Window

Puppies receive maternal antibodies through their mother's milk, but these antibodies wane between 6 and 16 weeks of age. The problem is that maternal antibodies can also interfere with vaccine efficacy. This is why puppies need multiple doses of each core vaccine — to ensure at least one dose takes effect after maternal immunity fades.

Titer Testing: An Alternative to Automatic Boosters

Titer testing measures the level of antibodies in your dog's blood to determine whether they still have adequate immunity from previous vaccinations. A sufficient titer means your dog is protected and does not need a booster at that time.

When Titer Testing Makes Sense

• Dogs with previous vaccine reactions — Avoids unnecessary exposure to vaccines that caused adverse effects
• Senior dogs — Many older dogs maintain immunity for years beyond standard booster schedules
• Immune-compromised dogs — Confirms whether vaccination is producing adequate protection
• Owner preference — Some owners prefer data-driven decisions about revaccination

Important limitation: Titer testing is only available for certain diseases (primarily distemper and parvovirus). Rabies titers are not accepted as a legal alternative to vaccination in most states. Always discuss titer testing with your veterinarian to determine if it is appropriate for your dog.

Vaccine Side Effects: What Is Normal

Mild side effects are common and typically resolve within 24-48 hours:

• Mild lethargy or reduced appetite
• Slight soreness at the injection site
• Low-grade fever
• Mild sneezing (intranasal vaccines only)

Contact your vet immediately if you observe facial swelling, hives, persistent vomiting, difficulty breathing, or collapse. These signs of an allergic reaction require urgent treatment.

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