Dog Vaccination Schedule — AAHA and WSAVA Guidelines (Core vs Non-Core)

The AAHA’s 2022 Canine Vaccination Guidelines significantly updated long-standing recommendations, formalizing the shift from annual to 3-year intervals for core vaccines and emphasizing risk-based decisions for non-core vaccines. The WSAVA Global Guidelines align closely with this approach. This article walks through the current core/non-core distinction, the puppy schedule, adult boosters, and titer testing — based on the actual published guidelines, not outdated practices that may persist at some clinics.

The TL;DR: puppies get a series at 6-19 weeks. Adult dogs get core boosters every 3 years (DHPP, rabies per state law). Non-core vaccines (leptospirosis, Lyme, Bordetella) are decided based on geography, lifestyle, and exposure — not automatically. Titer testing is an evidence-based alternative for owners wanting to verify continuing immunity.

For complementary pet content, see dog food AAFCO quality data and dog dental health VOHC data.

Core vs non-core — the framework

AAHA and WSAVA classify dog vaccines as:

Core (recommended for all dogs)

• Rabies — legally required in most U.S. states and many countries. Public health risk from exposure to wildlife and feral animals.
• DHPP combination:
  • D — Distemper (canine distemper virus)
  • H — Hepatitis (canine adenovirus type 1 and 2)
  • P — Parvovirus
  • P — Parainfluenza

The diseases in DHPP are highly contagious, often fatal, and have widespread exposure risk regardless of lifestyle. Vaccinating against them is recommended for every dog.

Non-core (risk-based)

• Leptospirosis — bacterial infection from wildlife urine, contaminated water. Risk depends on geography (more common in some U.S. regions) and lifestyle (drinking from puddles, hiking, rural exposure). AAHA recommends in most areas; some practices treat as core.
• Bordetella bronchiseptica (“kennel cough”) — required by most boarding facilities, dog daycares, training classes. Risk: confined social settings.
• Lyme disease (Borrelia burgdorferi) — tick-borne. Risk depends on geography (endemic in Northeast, upper Midwest, parts of West Coast) and outdoor exposure.
• Canine influenza (H3N2 and H3N8) — respiratory disease in social settings. Risk depends on local outbreak status and lifestyle.
• Rattlesnake vaccine — limited efficacy data; some vets recommend in high-snake-risk areas of Southwest/West.

The decision on non-core vaccines is made jointly with your vet based on your specific dog’s risk profile.

Puppy vaccination schedule (AAHA 2022)

Standard puppy schedule:

6-8 weeks

• DHPP (1st dose)
• Begin Bordetella if dog will be in social settings (intranasal or injectable)

10-12 weeks

• DHPP (2nd dose)
• Begin Leptospirosis if recommended (1st dose)

12-16 weeks

• Rabies (single dose; many states require by 16 weeks)
• Leptospirosis (2nd dose, 2-4 weeks after first)
• Begin Lyme if recommended (1st dose)

14-16 weeks

• DHPP (3rd dose)
• Lyme (2nd dose if started)

18-19 weeks

• DHPP (4th and final puppy dose)

Why multiple DHPP doses?

Maternal antibodies (passed from mother through milk) protect puppies for the first weeks of life but interfere with vaccine response. Maternal antibody levels vary by puppy, and the optimal vaccination window varies. By giving multiple doses through the antibody-decline window (6-19 weeks), at least one dose is given when maternal antibodies have waned enough for effective immunization.

This is why don’t socialize puppies in high-risk environments (dog parks, pet stores, areas with stray dogs) until the full series is complete (typically 18-19 weeks). Your vet may approve socialization in lower-risk environments (trusted vaccinated dogs, puppy classes with vaccinated peers) earlier.

Adult vaccination schedule

After completion of puppy series:

1 year post-puppy

• DHPP booster
• Rabies (1-year vaccine; some areas use 3-year vaccine after first 1-year)
• Lepto, Lyme, Bordetella, influenza if non-core decisions are yes

Every 3 years thereafter (AAHA 2022)

• DHPP
• Rabies (3-year vaccine, where state law allows)

Annually

• Lepto (immunity wanes faster)
• Bordetella (if continuing social settings)
• Lyme (if endemic area)
• Canine influenza (if continuing social settings)

The 3-year recommendation for core vaccines reflects evidence that immunity lasts well beyond annual schedules. Vaccines from major manufacturers (Merck, Boehringer Ingelheim, Zoetis) now have USDA-approved 3-year duration of immunity studies for core vaccines.

Titer testing — the alternative

Titer tests measure antibody levels to confirm continuing immunity. AAHA accepts titer testing as an alternative to automatic revaccination for distemper, parvovirus, and adenovirus.

How it works

A blood sample is sent to a lab (Cornell, University of Wisconsin, IDEXX). Results show whether antibody levels are at protective thresholds.

If titers show adequate protection, revaccination can be deferred. Repeat titer in 1-3 years to monitor.

Cost

• Single titer (parvo): $40-60
• Three-disease panel (distemper, parvo, adeno): $80-150
• Plus office visit for blood draw: $50-100

Per typical 3-year revaccination cost ($150-250), titer testing breaks even at the third year if avoiding even one revaccination cycle.

When titer testing makes sense

• Senior dogs (7+ years) where vaccine reactions may be more concerning
• Dogs with prior moderate or severe vaccine reactions
• Owners wanting evidence-based monitoring rather than blanket revaccination
• Dogs on immunosuppressive medications (chemotherapy, immune-mediated disease)

Limitations

• Rabies titers don’t replace legal vaccination requirement in most jurisdictions
• Some non-core vaccines (lepto) don’t have reliable titer correlation
• Titer values don’t directly equal “protected” — they suggest immune memory but not absolute guarantee

Vaccine reactions — what’s normal and what’s not

Mild (5-15% of vaccinations, normal)

• Lethargy 24-48 hours post-vaccine
• Mild fever
• Tenderness at injection site
• Decreased appetite for 1-2 days

These are immune system response, not concerning. No treatment needed; rest and water. Resolves within 48 hours.

Moderate (1-3%, monitor)

• Facial swelling (especially around eyes, muzzle)
• Hives
• Vomiting
• Diarrhea

These warrant veterinary call or visit. Antihistamine treatment usually resolves within 24 hours. Note for the chart — pre-medication may be recommended for future vaccines.

Severe (less than 1 in 10,000, emergency)

• Collapse
• Severe difficulty breathing
• Sudden severe weakness
• Severe vomiting/diarrhea
• Pale gums

Anaphylaxis — emergency veterinary treatment. Most occur within 30 minutes of vaccination, which is why many vets observe the dog in the clinic for 15-30 minutes after first vaccinations.

Risk factors for reactions

• Small breeds (Dachshund, Yorkshire Terrier, Maltese, Chihuahua) — higher rate
• Multiple simultaneous vaccines (5+ at once) — higher rate
• Prior reaction history — significantly higher rate

For higher-risk dogs, AAHA recommends:

• Pre-medication with antihistamine 30 minutes before vaccine
• Spread vaccines across multiple visits (e.g., DHPP one visit, rabies separate visit)
• Consider titer testing to defer revaccination when possible

Geographic risk for non-core vaccines

Leptospirosis

• High risk: Hawaii, Pacific Northwest, parts of Southeast, areas with dense wildlife (raccoons, deer)
• Lower risk: arid regions, urban-only dogs with no outdoor exposure
• AAHA increasingly recommends as quasi-core in most U.S. areas

Lyme disease

• Endemic high-risk: Northeast (NY, MA, CT, NJ, PA), upper Midwest (WI, MN, MI), parts of Pacific Coast (Northern CA, OR)
• Lower risk: Southwest, Southeast (most areas), Mountain West
• Tick exposure (hiking, rural, deer-frequented areas) drives recommendation

Bordetella

• Anywhere with social dog settings: boarding, daycare, training, dog parks, grooming
• Most facilities require it
• Low risk for completely solitary household dogs

Canine influenza (H3N2, H3N8)

• Outbreak-driven; risk varies year to year by region
• Social settings increase risk
• AAHA 2022: recommended in social/boarding-frequent dogs

Cost comparison

Standard adult dog (after puppy series), annual cost

Aggressive (annual everything):

• DHPP: $35
• Rabies: $25
• Lepto: $30
• Bordetella: $30
• Lyme: $40
• Influenza: $40
• Office visit: $60
• Total: $260/year

AAHA 2022 standard (DHPP every 3 years):

• DHPP every 3 years: $35 ÷ 3 = $12/year average
• Rabies every 3 years: $25 ÷ 3 = $8/year average
• Lepto annual: $30
• Bordetella annual (if needed): $30
• Lyme annual (if endemic): $40
• Office visit: $60
• Total: $180/year average

Minimum (core only, 3-year intervals):

• DHPP every 3 years: $12/year average
• Rabies every 3 years: $8/year average
• Office visit: $60
• Total: $80/year average

The AAHA 2022 schedule saves roughly $80/year vs annual everything, with equal disease protection per current evidence.

What to ask your vet

For each dog visit involving vaccinations:

1. Which vaccines do you recommend, and why? Should be tied to specific risk factors (geography, lifestyle, prior history).
2. What’s the duration of immunity for this vaccine? Should align with AAHA 2022 (3-year for core).
3. Does my dog need this annually or every 3 years?
4. Can we titer-test before revaccinating? For core vaccines, this is a reasonable question.
5. What reactions should I watch for?
6. Is this a 1-year or 3-year vaccine? (Particularly for rabies — the 3-year vaccine is the same product, just labeled differently for the 3-year duration.)

Vets following 2022 guidelines will engage these questions thoughtfully. Vets defaulting to annual everything regardless of guidelines may be worth a discussion or, in some cases, a second opinion.

Bottom line

AAHA 2022 guidelines updated decades-old practices toward evidence-based, risk-stratified vaccination:

• Core vaccines for all dogs: rabies, DHPP. Every 3 years for adults after puppy series.
• Non-core based on risk: leptospirosis, Lyme, Bordetella, influenza, rattlesnake. Decided with your vet based on your dog’s exposure profile.
• Titer testing as an evidence-based alternative for core vaccine continuation in adult dogs.
• Vaccine reaction awareness — most are mild, severe reactions are rare but possible.

The framework gives equal protection with reduced vaccine load and better-tailored decisions per dog.

For complementary pet care, see dog food AAFCO quality data and dog dental health VOHC data.