How Pet Insurance Works

Pet insurance pays back part of a vet bill after the fact. You pay a premium to keep the policy running. When your pet is treated, you usually pay the vet yourself, send the insurer the invoice, and get money back for the covered part of the bill: minus a deductible, at a reimbursement percentage, up to a limit. Charges the policy excludes, and anything that began before the policy or during a waiting period, come out before that sum starts. We don’t say whether to insure or which insurer to use; each section below points to the page or calculator that goes deeper.

Start with the pieces

In law, pet insurance is not health insurance. Nebraska’s Pet Insurance Act defines a pet insurance policy as “a property insurance policy that provides coverage for accidents and illnesses of pets” (Neb. Rev. Stat. 44-6504(5), read 12 November 2026). The rules written for human health plans do not carry over, and there is no federal pet insurance law.

Every policy is built from the same parts: a premium, a deductible (once a year, or once per condition), a reimbursement percentage, one or more limits, a list of exclusions, waiting periods, a rule on pre-existing conditions and sometimes a wellness add-on. Your own figures are on the declarations page, the first page or two of the policy. How pet insurance works, piece by piece explains each part with a worked example and the statute behind it.

What a bill pays back

A policy sold as “90%” does not pay 90% of the bill. It pays 90% of the charges it covers, and the deductible still comes off. What differs is the order of deduction. Deductible first: (covered charges − deductible) × percentage. Percentage first: (covered charges × percentage) − deductible. Both are in use. Of the six public sample policies and disclosure documents we read on 12 November 2026, published under four brand names, two apply the deductible first and four the percentage first. That is a count of documents, not of the market.

One of them prints its own example: a $2,000 invoice with $100 of charges that aren’t eligible, 90% reimbursement and a $250 deductible pays $1,900 × 90% = $1,710, minus $250 = $1,460 (Pets Best’s accident-only sample policy, form IAIC-PB10001-ACC, an Oklahoma sample, PDF dated September 2026, named only as a published example of the method). Taken deductible first, the same inputs give ($1,900 − $250) × 90% = $1,485, by our arithmetic. The pet insurance payout calculator runs one bill both ways on your own policy’s numbers. Its result is an estimate; your policy and the insurer’s claim decision decide.

What the premium is, and why it rises

There is no single price. The only national figures we found come from the insurers’ own trade association: in 2025 the average US accident and illness premium was $836 a year for a dog and $435 for a cat, up 11.5% and 12.6% on 2024 (industry data: NAPHIA, 2026 report, 2025 figures, read 12 November 2026). Those are averages across every insured pet, published by the industry that sells the policies. They are not a quote for yours.

Your own price depends on your pet and on the terms you choose. At renewal the insurer can set a new price, and no pet insurance statute we read limits how much it can rise. What the statutes require is disclosure. Nebraska’s makes the insurer say “whether the pet insurer reduces coverage or increases premiums based on the insured’s claim history, the age of the covered pet, or a change in the geographic location of the insured” (Neb. Rev. Stat. 44-6505(1)(d), read 12 November 2026). For five years of published averages and each reason a premium can go up, see what pet insurance costs and why premiums rise.

Accident-only or accident and illness

Accident-only insurance pays toward vet bills for injuries from a sudden event and nothing toward illness. Accident-and-illness insurance pays toward both. The same industry report puts the average accident-only premium in 2025 at $190 a year for a dog and $112 for a cat (industry data: NAPHIA, 2026 report, 2025 figures). The harder question is where a policy draws the line, because the model law and the state definition sections we read do not define “accident”. One public sample policy lists a cruciate ligament rupture among accidents; the one accident-only sample we read says cruciate ligament events and spinal disc conditions are “always considered medical Conditions”, and pays nothing toward them. Accident-only against accident-and-illness cover sets the two kinds side by side.

Waiting periods

A waiting period is a stretch of days after the policy’s effective date before some or all of the cover begins. There is no national rule. In the six public policy documents we read on 12 November 2026, waits ran from none to 15 days for accidents, 14 or 15 days for illnesses, and 30 days to 12 months for named orthopedic conditions.

Fifteen states limit them by statute: California, Delaware, Florida, Hawaii, Louisiana, Maine, Maryland, Montana, Nebraska, New Hampshire, Ohio, Pennsylvania, Rhode Island, Vermont and Washington. Nebraska’s wording is typical. Waiting periods may not “exceed thirty days for illness or orthopedic conditions not resulting from an accident. Waiting periods for accidents are prohibited” (Neb. Rev. Stat. 44-6506(2)(a), read 12 November 2026). The statutes were read in official text on 11 and 12 November 2026, New Hampshire’s in an Internet Archive copy of the official page dated 17 December 2025. In the other states we found no such limit in a pet insurance statute, so the policy decides.

The waiting periods page and its cover-start checker take the effective date and the waits printed in your own policy and estimate the first day each kind of cover applies, beside the rule we read in your state’s statute.

Pre-existing conditions

Policies generally exclude a condition a pet had before the policy began, and no law makes an insurer cover one. What the law does, in the same 15 states, is fix what the words mean. Washington enacted the model wording almost unchanged:

“Preexisting condition” means any condition for which any of the following are true prior to the effective date of a pet insurance policy or during any waiting period: (i) A veterinarian provided medical advice; (ii) The pet received previous treatment; or (iii) Based on information from verifiable sources, the pet had signs or symptoms directly related to the condition for which a claim is being made.

RCW 48.205.020(6)(a), read 12 November 2026

No diagnosis is needed. The same statutes put the proof on the insurer: “The pet insurer has the burden of proving that the preexisting condition exclusion applies to the condition for which a claim is being made” (Neb. Rev. Stat. 44-6506(1), read 12 November 2026). They also say a condition the policy has covered “cannot be considered a preexisting condition on any renewal of the policy” (Neb. Rev. Stat. 44-6504(6)(b)). Two states changed the tests: California asks for signs “consistent with the stated condition” (Cal. Ins. Code 12880(f)), and Vermont counts only the 180 days before the effective date (8 V.S.A. 7153(c)(6)), both read 12 November 2026. In a state without such a statute, the policy’s own definition governs. Pre-existing conditions in pet insurance has all 15 states section by section and the steps when a claim comes back marked “pre-existing”.

Wellness plans and add-ons

Accident-and-illness cover usually leaves routine care out. A wellness plan is a way to pay for that care, such as exams and vaccines, in monthly instalments, and it is usually not insurance. In the 14 states whose pet insurance statutes carry wellness sales rules (15 from 1 January 2027, when New Jersey’s law starts), an insurer or agent may not market a wellness program as pet insurance. But cover written into the policy is insurance whatever it is called. Ohio’s statute is the plainest: “All coverage included in a pet insurance policy is considered insurance, regardless of whether the coverage is described as a wellness benefit” (Ohio R.C. 3970.06(D)(1), read 12 November 2026). Wellness plans against pet insurance gives the rules state by state and the sum to do before paying for one. Which routine care your pet has is for you and your vet; your vet decides what is right for your pet.

Premiums against payouts: the break-even sum

Pet insurance pays back more than it costs only if the vet bills it covers turn out higher than a figure you can work out before you buy. With one hypothetical set of numbers ($50 a month rising 10% a year, a $250 annual deductible, 90% reimbursement, over five years), payouts match premiums when covered bills run about $1,064 a year, or about $1,092 if the policy takes its percentage before the deductible. The break-even calculator does the sum on your own premium, your own guess at the yearly rise and the bills you expect. It is arithmetic, not advice: no output says “worth it” or “not worth it”.

Where state law steps in

The 15 statutes above also carry a right to return a new policy (the “free look”) and required disclosures, including a summary of the formula the insurer uses to work out claim payments (for example Neb. Rev. Stat. 44-6505(3), read 12 November 2026). In the ones we read, none sets a deadline for the insurer to pay a claim, caps premium rises or guarantees renewal. Mississippi’s law, in force since 1 July 2023, requires disclosures only in the bill text we read (SB 2228 of 2023). New Jersey’s (P.L.2025, c.224) is not in force until 1 January 2027. Everywhere else, the policy’s wording and the state’s general insurance code apply. Each state’s rules are in pet insurance laws by state, and returning or ending a policy is on cancelling pet insurance.

Your next step

Find these in your own policy. Most are on the declarations page; the rest are in the definitions and the disclosure document.

• The deductible: the amount, whether it is annual or per condition, and how much of it you have already met this policy year.
• The percentage and the formula: is the deductible taken off before or after the reimbursement percentage?
• Every limit (annual, per condition or incident, lifetime) and how much of each is left.
• The exclusions list: exam fees, routine care and any named conditions.
• The waiting periods by kind, the effective date, and the definition of a pre-existing condition, beside your pet’s records from before that date.
• The premium line of the disclosure: whether the price changes with your pet’s age, your claims or a move.

If you and your insurer disagree about a claim, a cancellation or how a policy was sold, the regulator is your state insurance department. The NAIC keeps a directory of state insurance departments, each with its own complaint route.