Methodology — where every number comes from

The plan we model

Every premium estimate and claim split on this site assumes one "typical plan": $5,000 annual limit · $500 deductible · 80% reimbursement. That's deliberately the same configuration the big comparison sites use for published quotes, so you can check our numbers against public sources. Real plans vary — unlimited-cap plans cost roughly twice as much, higher deductibles cost less. Your quotes will differ; the relationships (breed, age, state effects) hold.

Premiums

Monthly premium = base(species, age) × breed factor × state index.

• Base age curve — calibrated to published quote points: NerdWallet's four-insurer samples at ages 2 and 8, Insurify's puppy/adult/senior averages, and MoneyGeek's senior-dog table. Dog: $40 / $44 / $50 / $62 / $82 / $105 / $128 / $150 per month across age brackets; cat: $21 / $22 / $24 / $30 / $39 / $50 / $62 / $72.
• Breed factor — from published breed premium tables (NerdWallet, Insurify, Spot), normalized to the $43/month national dog average. A French Bulldog runs ~1.75×; a small mixed-breed ~0.85×.
• State index — Insurify's June 2026 per-state premium table (all 50 states + DC), normalized to the national average. Massachusetts ≈ 1.49×, Mississippi ≈ 0.74×.

Surgery costs

National baselines come from published price sheets (fixed-price surgical practices, nonprofit clinics), real-invoice datasets, specialty-hospital cost pages and DVM-reviewed cost guides — each condition page lists its own citations. Where sources disagree we keep the range rather than averaging. State adjustment uses a vet-cost index derived from the premium index, regressed halfway toward 1.0 — that index is an estimate (no reliable per-state vet price table exists), and urban metros can run 20–40% above rural areas within the same state.

Claim odds

Breed condition risks use published prevalence and incidence studies where they exist (VetCompass, OFA statistics, breed-club and insurer data) — e.g. 19–24% lifetime IVDD signs in dachshunds, ~1-in-8 lymphoma in golden retrievers, 37–42% lifetime bloat in Great Danes. We then estimate the share of cases reaching claim-level treatment, and scale by how much of the condition's typical onset window your pet has already lived through. Where no published number exists, the figure is an editorial estimate and is labeled estimate wherever it appears.

The everyday-claims baseline

Big surgeries aren't the only claims. The average insured pet got back roughly 65% of premiums as paid claims in 2024 (computed from NAPHIA industry figures: $3.07B claims paid / $4.74B premium). We credit 50% of a breed-average premium as expected "everyday claim" payouts (ears, skin, GI, minor injuries), scaled by age and state — deliberately conservative so the named risks don't double-count. Enrolling an older pet discounts this by 5% per year of age (capped at 55%), because more of an older pet's likely claims are already pre-existing and excluded.

The verdict

The verdict is two-part, and lands on one of three outcomes:

1. Expected value: projected payouts vs projected premiums over the pet's remaining life. A real chance (≥15% single risk, or ≥20% combined) of a ≥$4,000 bill, or ≥80% of premiums back, computes "clearly worth it." Below ~45% back with no major risk ahead: "probably not worth it — self-insure instead."
2. Variance protection: even at negative expected value, insurance converts a possible five-figure crisis into a fixed monthly cost. Profiles in between compute "worth it if a big bill would be a crisis" — the honest pro-insurance case for households where a surprise bill would force a bad decision. The average dollar returned is still less than a dollar, and the verdict says so plainly: you're buying the worst-case cap, not a payout on average.

Pets at or past common enrollment-age caps (~14) get an automatic "not worth it" — most insurers won't newly enroll them, and pre-existing exclusions would gut the value anyway. Roughly a third of profiles land in the crisis-hedge or "not worth it" buckets. If a calculator funded by insurance referrals never said no, you shouldn't trust it. The offer always matches the advice: "not worth it" verdicts point at a savings account, uninsurable cases point at discount plans and financing — never at a policy the math just argued against.

What this is not

Not veterinary advice, not financial advice, not a quote. It's decision support with its assumptions exposed. Talk to your vet about medicine and read any policy's exclusions before buying it.

Corrections and freshness

Every page shows when its numbers were last reviewed. Data files carry per-figure source URLs and access dates; an automated weekly check flags dead links and figures older than 12 months for re-verification. Spot an error? Email TrueVetCost — corrections ship within days and get noted.