Pet Insurance and Pre-Existing Conditions: What Counts and What You Can Do

A pre-existing condition is generally any illness or injury your pet showed signs of, was examined for or was treated for before the policy started or during its waiting period. Most pet insurance policies exclude these conditions. Some insurers will cover curable problems again after a set symptom-free period, but chronic conditions such as diabetes or allergies are usually excluded for good.

This is a general explanation, not advice on a particular policy. Definitions vary between insurers and countries, and the policy wording is what counts.

What counts as pre-existing

In the US, the National Association of Insurance Commissioners (NAIC) Pet Insurance Model Act, adopted in 2022 as a template that states can enact in whole or in part, treats a condition as pre-existing if, before the policy’s start date or during a waiting period:

• a veterinarian gave medical advice about it,
• the pet received treatment for it, or
• there is verifiable evidence of symptoms directly related to it.

Note that a diagnosis is not required. If your vet wrote “limping on left hind leg, monitor” a month before you bought cover, a later knee claim may be treated as pre-existing. In UK and Australian policies, wording is similar: signs or symptoms noticed before cover, whether or not anyone named the condition.

Under the model act, the insurer has to prove that the exclusion applies, and a condition that was covered cannot be reclassified as pre-existing when you renew. Not every state has adopted these rules, so check with your state insurance department if you are unsure.

Curable vs incurable conditions

Many insurers split pre-existing conditions into two groups:

Insurers decide which conditions count as curable, and some exclude whole categories, such as knee and ligament problems, from this second chance. Ask for the list in writing.

The bilateral rule

Some conditions often affect both sides of the body, such as cruciate ligament injuries in the knees, hip or elbow dysplasia, and some eye problems. Many policies treat both sides as one condition. If the left knee had problems before cover began, a later right-knee injury may also be excluded.

This is one of the most disputed clauses. In the UK, the Financial Ombudsman Service has ruled in individual cases that applying a bilateral exclusion was unfair when veterinary evidence showed the second problem was unrelated, such as a separate injury. Outcomes depend on the facts and the wording, so keep your vet’s notes.

How insurers find out: the records lookback

Most insurers do not examine your pet before selling a policy. Instead, they request your pet’s veterinary records when you make your first claim, or sometimes at enrollment.

1. The lookback period. Insurers commonly review the past 12 to 24 months of records, or the pet’s whole history for a young animal. The exact period is in the policy.
2. What they look for. Any note of symptoms, tests, medications or advice related to the condition you are claiming for.
3. Why honesty matters. Leaving out known history on an application can lead to claims being refused or a policy being cancelled.
4. Ask for a review. Some insurers offer a pre-enrollment or early medical history review on request, so you know what will be excluded before you rely on the cover.

Under the NAIC model act, a policy must also allow you to shorten waiting periods through a vet exam, at your own cost unless the policy says otherwise. Waiting periods there are capped at 30 days for illness, with none allowed for accidents.

If your pet already has a condition

A diagnosis does not mean insurance is pointless. It means the cover will be narrower. Options to consider:

• Insure for everything else. Accident and illness cover still pays for new, unrelated problems, which can be expensive on their own.
• Check curable-condition rules if the problem was a one-off that has fully resolved.
• Do not switch insurers lightly. A condition covered by your current policy may become pre-existing under a new one. This matters most for older pets. See our guide on pet insurance cost per month before chasing a cheaper renewal.
• Look at UK lifetime policies carefully. They typically cover ongoing conditions year after year, but only for conditions that start after cover begins.
• Build a vet fund. For a known chronic condition, setting aside a fixed amount every month for its care is often more predictable than any policy.
• Talk to your vet about costs. Ask for an itemized estimate and whether there are lower-cost treatment options; many practices also offer payment plans.

For the basics of deductibles, limits and claims, see how pet insurance works, and for a decision framework, is pet insurance worth it. The AVMA’s pet insurance page is a useful neutral starting point.

Bottom line

Pre-existing conditions are anything with signs, advice or treatment before cover starts, diagnosed or not. Curable problems may be covered again after a symptom-free period; chronic ones generally are not, and bilateral rules can extend an exclusion to the other side of the body. Insure while your pet is young and healthy, keep accurate records, and read how your policy defines each term before you buy.

FAQ

Can I get insurance for a pet with a pre-existing condition?

Usually yes, but that condition, and possibly related ones, will be excluded. New, unrelated illnesses and injuries can still be covered.

Will the insurer know about a condition I did not mention?

Very likely. Insurers typically review vet records when you claim, and anything noted before cover began can be excluded.

Are hereditary conditions pre-existing?

Not automatically. Many policies cover hereditary and congenital conditions if no signs appeared before cover started, but some exclude them. Check the wording.

Does a waiting period illness count as pre-existing?

Generally yes. Symptoms that begin during the waiting period are usually treated the same as those that started before the policy.