Vaccines are one of the few interventions in veterinary medicine where the cost-benefit case is overwhelmingly clear. They prevent diseases that were leading causes of canine death within living memory and remain endemic in many parts of the world. The current 2026 schedule, aligned with the American Animal Hospital Association (AAHA) Canine Vaccination Guidelines and similar guidance from WSAVA internationally, distinguishes between core vaccines (recommended for every dog), non-core vaccines (recommended based on lifestyle and geography), and non-recommended products. This overview walks through the schedule, what each vaccine covers, and the most common questions owners ask.
This article is general information. Always consult your veterinarian for vaccine choices specific to your dog and your region. Local disease prevalence, your dog’s health status, and travel plans all change what is appropriate.
Core vs non-core vaccines
The 2024 AAHA guidelines, still in force in 2026 with minor updates, divide canine vaccines into three categories.
Core (recommended for every dog):
- Canine distemper virus (CDV)
- Canine parvovirus (CPV)
- Canine adenovirus-2 (CAV-2, protects against infectious canine hepatitis and contributes to kennel cough protection)
- Rabies virus
The first three are typically combined into a single injection abbreviated DAP or DHPP. Rabies is administered separately and is required by law in most jurisdictions.
Non-core (recommended based on risk):
- Leptospirosis (recommended for most dogs in 2026 given rising urban exposure)
- Bordetella bronchiseptica (kennel cough, recommended for dogs that board, attend daycare, or go to grooming, training class, or dog parks)
- Canine parainfluenza virus (often included in kennel cough vaccines)
- Lyme disease (Borrelia burgdorferi, recommended in endemic areas)
- Canine influenza (H3N2 and H3N8, recommended for social dogs in many regions)
- Crotalus atrox toxoid (rattlesnake vaccine, regional, limited evidence base)
Not generally recommended:
- Coronavirus
- Giardia
Your veterinarian will recommend non-core vaccines based on where you live, where you travel, and how your dog lives.
Standard puppy series
The current schedule for a healthy puppy from a known background:
| Age | Vaccines |
|---|---|
| 6 to 8 weeks | DAP (first dose) |
| 10 to 12 weeks | DAP (second dose), +/- non-core |
| 14 to 16 weeks | DAP (third dose), rabies, +/- non-core |
| 16 to 20 weeks | DAP (final dose if not given), confirm rabies done |
| 12 months | DAP booster, rabies booster, lifestyle non-core boosters |
The reason for the multiple-dose series in puppyhood is that maternal antibodies from the dam can block vaccine response in early life. Repeating the DAP series past the point at which those maternal antibodies have faded ensures that at least one dose successfully establishes immunity. The final dose at 16 to 20 weeks is critical and is the most common dose owners skip, often because puppies appear healthy and owners forget the appointment.
Adult schedule
After the 12-month booster, the schedule extends:
- DAP: typically every 3 years for most products. Some veterinarians offer titer testing as an alternative.
- Rabies: every 1 or 3 years depending on local law and the product used. Some jurisdictions require 1-year rabies regardless of product.
- Leptospirosis: annually. The immunity period is shorter than the core vaccines.
- Bordetella: every 6 to 12 months depending on product and risk.
- Lyme, canine influenza: annually if used.
Senior dogs (typically over age 7) follow the same schedule unless a health condition changes the calculus. Vaccine guidelines explicitly do not recommend skipping vaccines in older dogs simply because of age.
Side effects and what to watch for
Most dogs experience either no symptoms or mild ones after vaccination. Common and expected:
- Mild soreness at the injection site for 24 to 48 hours
- Brief lethargy or reduced appetite the day of vaccination
- Low-grade fever for under 24 hours
Less common but possible:
- Localized swelling at the site that resolves within a few days
- Vomiting or diarrhea within 12 hours
Rare but important to recognize as an emergency:
- Facial swelling, hives, or itching
- Difficulty breathing
- Collapse
- Severe vomiting or diarrhea
If you see any of the third group, contact your emergency veterinarian immediately. The reaction is treatable but time-sensitive.
For dogs with a prior reaction, your veterinary team may recommend:
- Pre-medication with an antihistamine or short-acting steroid
- Splitting multiple vaccines across separate visits a few weeks apart
- Switching to a different brand or formulation
- Titer testing in lieu of revaccination where legally permitted
Titer testing
Antibody titer testing measures protective antibody levels for specific diseases. For DAP, a positive titer is widely accepted as evidence of ongoing immunity. For rabies, a titer is meaningful for travel certification in some countries but does not replace a legally required vaccine in most jurisdictions.
Titer testing is a reasonable option for:
- Adult dogs with prior vaccine reactions
- Dogs with confirmed autoimmune conditions
- Owners working with their veterinarian on a tailored schedule
It is not generally needed for the standard puppy series, where the cost of testing is similar to the cost of the vaccine and the goal is to establish initial immunity.
Travel and boarding requirements
If you board your dog, attend daycare, or travel internationally, plan vaccine timing well in advance:
- Most boarding facilities require Bordetella within the last 6 to 12 months
- Many dog daycares require canine influenza
- International travel often requires rabies titer testing 3 to 6 months before departure, plus updated rabies certificate
- Some countries require additional vaccines (e.g. leptospirosis) or have quarantine rules
Your veterinarian can issue an international health certificate within 10 days of travel, but the underlying vaccine work must be done earlier.
Cost in 2026
Typical 2026 US pricing at a general practice:
- DAP: 25 to 45 USD per dose
- Rabies (1 or 3 year): 20 to 40 USD
- Leptospirosis: 30 to 50 USD
- Bordetella: 30 to 50 USD
- Canine influenza: 35 to 55 USD per dose
- Titer testing: 100 to 200 USD
Low-cost vaccine clinics and shelter wellness clinics often offer significantly lower pricing for core vaccines.
Common owner mistakes
- Skipping the 16-week booster. This is the single most important dose for establishing puppy immunity.
- Letting an adult dog lapse for years. Catching up on missed boosters often requires repeating doses unnecessarily.
- Refusing rabies vaccination. Beyond the medical case, it is legally required almost everywhere and protects both the dog and the public.
- Buying vaccines online and administering at home. This is legal in some regions but bypasses the veterinary exam that catches early disease and ensures the dog is healthy enough to vaccinate.
- Refusing non-core vaccines without discussion. Leptospirosis is a serious zoonotic disease that has increased in urban areas. Talk to your vet about your dog’s specific risk.
Always consult your veterinarian to design a vaccination plan that fits your dog’s age, health, lifestyle, and local disease exposure.
Frequently asked questions
Which vaccines does every dog need?+
The current AAHA-recognized core vaccines for North America are canine parvovirus, canine distemper virus, canine adenovirus-2 (which covers hepatitis), and rabies. Every healthy dog should receive these unless your veterinarian advises a specific medical exception.
How often do adult dogs need booster shots?+
Most modern core vaccines (DAP) provide at least 3 years of immunity after the first adult booster, and many provide longer. Rabies boosters are typically every 1 or 3 years depending on your local law and the vaccine product. Non-core vaccines like leptospirosis are annual.
What is titer testing and when is it useful?+
A titer test measures antibody levels in the blood to estimate whether a dog still has protective immunity from a previous vaccination. It is useful for owners who want to confirm immunity before re-vaccinating, particularly for adult dogs with histories of vaccine reactions. Rabies vaccination is required by law regardless of titer in most jurisdictions.
Are vaccine side effects common?+
Mild reactions (sore injection site, mild lethargy, brief low-grade fever) are common in the 24 hours after vaccination and resolve on their own. Serious reactions are rare, and your veterinary team can advise on pre-medication or staggered schedules for at-risk dogs.
Morgan Davis
Morgan Davis writes for The Tested Hub.