Pet Insurance and Pre-Existing Conditions
Quick answer
PDSA says most pet insurance policies do not cover pre-existing illnesses or injuries, so it advises taking out cover as early as possible. In the US, the NAIC's Pet Insurance Model Act defines a pre-existing condition as one a vet gave advice on, treated, or that showed signs before cover started or during a waiting period, and says a condition covered under a policy cannot become pre-existing at renewal.
From PDSA and the NAIC Pet Insurance Model Act. Not veterinary or financial advice. Worried about your pet now?
On this page (6 sections)
What counts as pre-existing
The NAIC Pet Insurance Model Act, a model law that US states can adopt, says a condition is pre-existing if, before the policy started or during a waiting period, a vet gave medical advice about it, the pet was treated for it, or there were signs or symptoms directly related to it. It separately defines a chronic condition (one that can be treated or managed but not cured) and a hereditary disorder (an abnormality passed from parent to offspring). Source: NAIC, Pet Insurance Model Act (Model 633).
Why it matters
PDSA says most policies exclude pre-existing illnesses and injuries, which is why it advises insuring a pet as early as possible: a condition found before cover starts may never be covered by a new policy. It also explains that time-limited and maximum-benefit policies cap what they pay for each condition, while lifetime cover resets its annual limit at renewal, which matters most for long-term conditions. Source: PDSA, Pet insurance guide.
Waiting periods and renewals
Under the NAIC model law, insurers must disclose waiting periods before you buy; the waiting period for illnesses and non-accident orthopaedic conditions may not exceed 30 days; waiting periods for accidents are not allowed; and waiting periods cannot be applied again at renewal. An insurer may let a vet exam waive a waiting period, but must warn that the exam records may lead to a pre-existing exclusion, and it cannot require an exam to renew. Source: NAIC, Pet Insurance Model Act (Model 633).
Before you buy or switch
- Read the exclusions list in the policy wording, not just the summary. The NAIC model law requires exclusions for pre-existing, hereditary, congenital and chronic conditions to be disclosed.
- Think carefully before switching insurer: a condition covered by your current policy may count as pre-existing to a new one.
- Keep your pet's vet records; insurers use them to decide claims.
Sources: NAIC, Pet Insurance Model Act (Model 633); PDSA, Pet insurance guide.
This page is not financial advice. We do not recommend insurers and take no commission.
Questions people ask
Does pet insurance cover pre-existing conditions?
PDSA says most pet insurance policies do not cover pre-existing illnesses or injuries, and advises taking out cover as early as possible.
What counts as a pre-existing condition for pet insurance?
Under the NAIC Pet Insurance Model Act, a condition is pre-existing if, before cover started or during a waiting period, a vet gave advice about it, it was treated, or the pet had related signs or symptoms.
Can a covered condition become pre-existing when I renew?
Not under the NAIC model law: a condition covered under a policy cannot be treated as pre-existing on a renewal. Switching to a new insurer is different, so check before you switch.
How long is the waiting period for pet insurance?
Under the NAIC model law, waiting periods for illnesses and non-accident orthopaedic conditions may not exceed 30 days, and waiting periods for accidents are not allowed. Policies outside its scope may differ.
Sources
- PDSA, Pet insurance guide, read 7 November 2026.
- NAIC, Pet Insurance Model Act (Model 633), read 7 November 2026.
Related pages
Pet insurance explained: the four types, is pet insurance worth it?, excess and co-payments and average premiums.