Methodology: sources, schedule logic, and refresh cadence
What this site cites, how the schedule generator works, where the cost ranges come from, what is in scope and out of scope, the limitations the site is honest about, and the corrections process. Reviewed against the cited primary sources May 2026.
Last reviewed May 2026
Primary sources
Every schedule, dose interval, and protocol on this site traces back to one of the sources below. Where a passage on the site appears to disagree with the cited source, it is the cited source that wins; the page is updated. Cost-data sources are kept separate from clinical-protocol sources so the distinction is visible.
| Source | Refresh cadence | What we take from it |
|---|---|---|
| AAHA 2022 Canine Vaccination Guidelines | Every 2-3 years | The American Animal Hospital Association is the primary US authority on companion-animal vaccination. The 2022 guideline supersedes the 2017 revision; the next revision is expected 2025-2026. The site takes the US core schedule (DHPP at 6, 9-10, 12-13, 16 weeks; rabies at 12-16 weeks; the 16-week dose as the maternal-antibody-override anchor) and the non-core lifestyle vaccine framing directly from this guideline. |
| WSAVA Vaccination Guidelines for the Owners and Breeders of Dogs and Cats | Every 5-6 years | The World Small Animal Veterinary Association global guideline is the authority used internationally and the primary reference for the UK schedule. The current edition is 2024. The site uses WSAVA for the fully-protected-date rule (final puppy dose plus two weeks), the position on adult-booster intervals (DHPP not more often than every 3 years post-1-year-booster), and the framing of titer testing. |
| BSAVA Position Statement on Vaccination | On revision | The British Small Animal Veterinary Association position statement is the UK-specific authority used for UK primary-course timing (8-10 and 10-12 weeks with optional 14-16 week final dose), Leptospirosis serovar coverage (Lepto 2 vs Lepto 4 framing aligns with BSAVA's published guidance), and the position that UK annual boosters are not legally mandated. BSAVA's position is consistent with WSAVA on adult booster intervals. |
| AVMA Vaccination Principles | On revision | The American Veterinary Medical Association vaccination principles page is used as a cross-reference on owner-facing framing (what core vs non-core means in plain language) and for general statements about vaccine-preventable disease that need a clinical-association source rather than a research-paper source. |
| AVSAB Position Statement on Puppy Socialization | On revision | The American Veterinary Society of Animal Behavior position statement is the authority cited on the /when-can-puppy-go-outside page for the 3-14 week socialisation window, the AVSAB recommendation that controlled socialisation can begin before the primary series is complete, and the AVSAB framing that under-socialisation risk often exceeds infection risk in low-prevalence environments. |
| UC Davis VMTH Shelter Medicine Protocols | Monthly review | The UC Davis Veterinary Medical Teaching Hospital shelter-medicine program is the cited source for the high-risk shelter protocol where DHPP can be started as early as 4-6 weeks of age, the rationale being that parvo exposure risk in a shelter environment outweighs the reduced vaccine efficacy at that age. |
| Moore et al, JAVMA 2005 (adverse vaccine reactions in dogs) | Static (published study) | Adverse vaccine reactions in dogs: 38 vaccines and 1,226,159 vaccinated dogs (Moore, DeSantis-Kerr, Guptill, Glickman) is the authority cited on the /breed-size-notes and /adverse-reactions pages for the breed-size adverse-event gradient (toy and small breed elevated rates) and for the absolute incidence of vaccine adverse events (38.2 events per 10,000 dogs in the study population). |
| Lemonade Pet 2024 Cost of Care report | Annual | Used as one input to the US cost ranges. Lemonade Pet's published cost-of-care figures cover routine puppy visits, vaccine bundles, and per-state averages. Where Lemonade and ManyPets disagree on a US number (Lemonade is US-only; ManyPets has US data too), the lower and upper bounds form the range. |
| ManyPets 2025 Veterinary Pricing Data | Annual | Used as the primary input to the UK cost ranges. ManyPets is the largest UK pet insurer and publishes UK-specific vaccination cost data (the GBP 68-151 range for the primary course, with an average of GBP 106, is taken directly from this source). UK regional pricing in the /uk/cost page draws on the same ManyPets dataset. |
| Embrace Pet Insurance claims data | Annual | Cross-reference for the US cost range. Embrace publishes claims-based aggregate figures for puppy vaccination spend in the first year, which sits within the Lemonade range and is used to confirm the published $75-$400 first-year band. |
| PDSA and Blue Cross published charity-vet rates | On revision | The UK charity-vet floor on the /uk/cost page is anchored to PDSA's published criteria (means-tested service for low-income households) and Blue Cross's published rates. The floor of the UK cost band reflects these charity options where eligibility applies, not the open-market vet price. |
| US state rabies statutes (15 states) | On revision | The /us page summarises rabies vaccination law for 15 US states. Each row is verified against the state statute (Michigan and Virginia mandate 4-month minimum, all others 12 weeks) or the AVMA-published summary of state rabies laws. Hawaii is included as a special case (rabies-free state, import quarantine). |
In scope
- The AAHA 2022 canonical US schedule with week-by-week DHPP and rabies dosing and the 16-week final dose anchor.
- The BSAVA / WSAVA UK schedule with the two-jab primary course and the optional 14-16 week final dose per WSAVA's maternal-antibody-override position.
- US state rabies law for 15 named states (minimum age, first booster interval, subsequent frequency).
- Cost ranges derived from published industry data (Lemonade Pet, ManyPets, Embrace, PDSA) presented as low / mid / high bands, not as point estimates for any individual clinic.
- Per-vaccine deep dives for DHPP, rabies, Bordetella, Leptospirosis, Lyme, and canine influenza covering mechanism, dose schedule, published cost range, and adverse-event profile.
- AVSAB socialisation guidance synthesised with AAHA fully-protected-date math to produce a single answer to 'when can my puppy go outside?' for a given date of birth.
- Breed-size adverse-event guidance per Moore et al, with toy and small-breed elevated-risk framing and giant-breed timing notes.
Out of scope
- Individual veterinary diagnosis. Specific clinical decisions for an individual puppy require an in-person vet consultation.
- Specific clinic pricing quotes. Ranges are estimates from published industry data; individual clinic pricing depends on geography, bundle structure, and services not captured here.
- Prescription decisions. Vaccine selection for an individual puppy is the attending vet's decision based on local disease prevalence and the puppy's individual risk.
- Off-label use of vaccines. Where AAHA, BSAVA, or WSAVA explicitly recommend against a use case (annual DHPP boosters for adult dogs, for example), the site presents the guideline position rather than the practice that some clinics still follow.
- Country-specific vaccine licensing outside the US and UK. The schedule covers AAHA (US) and BSAVA / WSAVA (UK / global) only. Other national authorities (e.g., the European Society for Veterinary Dermatology, JSAVA in Japan) are not covered.
- Pet-travel paperwork beyond the rabies entry on the /vaccines/rabies page. Animal Health Certificates, microchip rules, and tapeworm treatment for re-entry are out of scope and the user is referred to the relevant national authority.
Calculation framework
How the schedule generator, the fully-protected date math, and the cost ranges are computed. The formulas are shown so a reader can re-run them against their own inputs and recover the same numbers the site produces.
Schedule generation
The calendar generator takes the puppy's date of birth and applies AAHA-anchored week offsets for US schedules (DHPP at +6, +9, +12, +16 weeks; rabies at +12 to +16) or BSAVA / WSAVA-anchored offsets for UK schedules (first jab +8 to +10, second jab +10 to +12, optional WSAVA-aligned third at +14 to +16). The output is appointment dates plus the vaccines that fall on each visit, exported as both a printable view and an ICS calendar file.
Fully-protected date
The fully-protected date is computed as the final puppy dose date plus two weeks, per WSAVA's published guidance. For US puppies on the 16-week final dose, this works out to approximately 18 weeks of age; for UK puppies finishing the standard two-jab course at 10-12 weeks, it is approximately 12-14 weeks. The /when-can-puppy-go-outside page surfaces this date alongside the AVSAB socialisation-window guidance.
Cost range methodology
Cost ranges are constructed as low / mid / high bands. Low = charity vet (UK: PDSA / Blue Cross where eligible) or low-cost vaccine clinic (US: SPCA / shelter clinic / mobile-vaccine event). Mid = average reported by published industry data (ManyPets 2025 UK average GBP 106; Lemonade Pet 2024 US national average ~$200 first year). High = full-service private practice in a high-cost-of-living urban area. Ranges are estimates; individual clinic pricing varies and the site says so on every cost page.
Breed-size adjustment
Schedule timing does not change by breed size. The Moore et al 2005 finding is that toy and small breed dogs have an elevated adverse-event rate per vaccination, not that they need a different schedule. The /breed-size-notes page surfaces the elevated-monitoring framing (split Lepto from DHPP for small breeds; longer post-vaccine observation period; morning appointment booking to allow same-day vet access if a reaction occurs) rather than altering doses or intervals.
Titer testing rationale
AAHA 2022 and WSAVA 2024 both permit titer testing as an alternative to fixed adult boosters for DHPP (distemper and parvovirus). Titer testing is not legally accepted for rabies in most US states (state law requires the certificate, not proof of immunity) and is not reliable for Leptospirosis (titers do not correlate well with protection for Lepto). The /adult-booster-schedule page presents titer testing as a valid tool for reducing over-vaccination in adult dogs with the legal-substitution caveats explicit.
Refresh cadence
Clinical sources update on their own schedules (AAHA every 2-3 years, WSAVA every 5-6, BSAVA on policy change). Between revisions, the site holds to the most recent published guideline. Cost-data sources update annually (Lemonade, ManyPets, Embrace publish refreshed numbers each year); the site re-pulls those on the first business week of each month and refreshes the cost-page ranges if the published numbers have shifted by more than a small margin.
A single LAST_VERIFIED_DATE constant is imported by every page. The footer text, the schema dateModified, and the visible review timestamp all read from that single source. A cosmetic refresh without a content review is not possible: bumping LAST_VERIFIED_DATE requires a corresponding source-review commit.
Out-of-cycle refreshes are triggered by: an AAHA / WSAVA / BSAVA guideline revision; a US state rabies law change for one of the 15 covered states; an industry-wide pricing data refresh from Lemonade, ManyPets, or Embrace; a major vaccine recall or safety advisory; and any flagged correction that points to a passage disagreeing with its cited source.
Limitations
- Veterinary guidance evolves. AAHA revises every 2-3 years; WSAVA every 5-6; BSAVA on policy change. Between revisions, the site holds to the most recent published guideline. Where a revision is in draft (e.g., AAHA 2025-2026 expected revision), the site notes the upcoming change but does not preempt it.
- Maternal antibody timing varies by puppy. The 4-dose US schedule and the 3-dose UK schedule are designed to bracket the population variation in maternal antibody decay. For an individual puppy, the optimal dose timing may differ; the attending vet's judgement on day-of-vaccine health and timing supersedes the canonical schedule.
- State rabies law summarised only for 15 US states. The remaining 35 states are referenced via the AVMA-published state-rabies-law summary. For the most current state-specific requirement, the relevant state agriculture or veterinary board is the primary source.
- Cost ranges are estimates. Individual clinic pricing depends on geography, clinic type (corporate vs independent), bundled services, optional add-ons (microchipping, deworming, fecal exam), and locally negotiated pet-insurance copay structures. The ranges shown reflect the published industry data and are not a substitute for an itemised quote from a specific clinic.
- Affiliate disclosures are surfaced on pages where an affiliate placement exists. The pet-insurance comparison cards on the homepage are flagged as affiliate; where the underlying program is not yet active, the cards link to a placeholder rather than to a tracked URL, and the disclosure language is shown verbatim. Editorial selection of which insurers are mentioned is independent of any active affiliate relationship.
Corrections process
For corrections, source disagreements, or to flag a passage that does not match its cited primary source: contact Digital Signet via digitalsignet.com. The strongest corrections point to a specific named source (AAHA paragraph, WSAVA section, state statute, JAVMA paper) and quote the relevant passage. Corrections of that form are reviewed within 5 business days and either applied or replied to with the editorial rationale for the existing wording.
For urgent veterinary questions about an individual puppy, contact your vet rather than this site. The decision support here is for planning across the puppy primary series, not for day-of-symptoms triage.