Last updated: September 2026
Quick answer: Standard UK pet insurance does not cover pre-existing conditions, meaning any illness or injury your pet showed signs of, was treated for or received advice about before the policy started or during the waiting period. Some insurers will lift the exclusion if the condition has been symptom-free for a set time, which ranges from around three months for minor problems to two years for more serious ones. Lifelong conditions such as arthritis usually stay excluded for good. A few specialist policies will cover declared conditions, but with limits and higher premiums.
Pre-existing conditions are the most common reason pet insurance claims are turned down, and the rules are stricter than most owners expect. This guide explains how insurers define the term, how they find out, and what your options are if your dog or cat already has a health history.
What counts as a pre-existing condition?
Insurers use broad definitions. A condition is usually treated as pre-existing if, before your cover started or during the waiting period, your pet:
- Showed any symptoms of it, even if the vet never made a formal diagnosis.
- Was examined, treated or medicated for it.
- Was the subject of advice about it, including advice given over the phone.
Three details catch owners out:
- Undiagnosed symptoms count. If the vet notes record a limp, the insurer may exclude a later cruciate ligament problem in that leg, even though nothing was diagnosed at the time.
- Related conditions can be excluded too. Skin problems, ear infections and allergies are often linked, and an exclusion for one can extend to the others.
- Some conditions count for both sides of the body. Many policies treat problems such as cruciate ligament damage or hip dysplasia as “bilateral”: if one knee or hip had problems before cover started, the other may be excluded as well. See our guides to cruciate ligament surgery costs and hip dysplasia surgery costs.
The waiting period also matters. Typical policies won’t cover illnesses that first show signs in the first 14 days, or accidents in the first 48 hours. Anything that starts in that window becomes pre-existing.
How insurers find out
When you make a claim, the insurer asks your vet for your pet’s clinical history, often covering its whole life or at least the last couple of years. Every note is visible: symptoms, phone calls, treatments and throwaway comments such as “slightly stiff on the left hind leg”.
That is why honesty at the start matters. If you don’t declare a known condition when you buy, the insurer can refuse related claims and, in serious cases, cancel the policy. Declaring everything costs nothing and avoids a much bigger problem later.
Can a pre-existing exclusion be removed?
Sometimes, if the condition has cleared up and stayed clear. How long your pet must be symptom-free depends on the insurer and the condition.
| Example | How insurers typically treat it |
|---|---|
| Minor, one-off problem (such as kennel cough) | Petplan gives the example of removing a kennel cough exclusion after three months without symptoms |
| More serious condition resolved with treatment (such as a perforated eardrum) | Petplan says this would need to be symptom-free for 12 months after surgery |
| Most other resolved conditions | Many insurers require a set period, often two years, without symptoms |
| Lifelong conditions (such as arthritis) | Usually excluded permanently |
Across the market, symptom-free periods range from about three months to two years, depending on the insurer and how serious the condition was. “Symptom-free” usually means no symptoms, no treatment, no medication and no vet visits about that condition for the whole period. Even then, lifting the exclusion is normally at the insurer’s discretion, so ask how your insurer reviews it.
Specialist policies for pets with a medical history
A small number of insurers offer policies that will consider declared pre-existing conditions. You declare everything when you buy, and the insurer agrees terms for each condition. Expect some or all of the following:
- Higher premiums. The more conditions, the higher the price.
- Lower limits for claims linked to the existing condition, especially in the first year.
- Symptom-free requirements before the condition is covered.
- Exclusions for linked conditions, even if the main one is covered.
Asda Money sums up the trade-off: policies that include existing conditions tend to cost more and cover less. Compare the cap for the existing condition, the annual limit and the excess before you buy, not just the monthly price.
Switching insurer turns past conditions into exclusions
This is the rule that traps loyal customers. Any condition your pet has been treated for under your current policy will become a pre-existing condition with a new insurer. On a lifetime policy, that is exactly the cover you are paying for. Read switching pet insurance before you move, and understand why premiums rise in why has my pet insurance gone up?
How to avoid pre-existing exclusions
- Insure early. You can usually insure a puppy or kitten from eight weeks old, before any health history exists.
- Choose lifetime cover from the start. It keeps covering conditions that develop after the policy begins, year after year. See lifetime vs time-limited vs maximum benefit cover.
- Never let cover lapse. A gap of even a day can mean a new policy with new exclusions.
- Declare everything honestly. It protects every other claim you make.
- Read your vet notes. You are entitled to see your pet’s records; ask the practice to correct anything inaccurate.
What to do if a claim is rejected as pre-existing
- Ask for the reason in writing, including which vet note the insurer relied on.
- Get the clinical history from your vet and check it. A vague note may not support the insurer’s decision.
- Ask your vet for a written opinion if you believe the new problem is unrelated to the old one.
- Complain to the insurer, quoting the policy wording.
- Go to the Ombudsman. If you’re unhappy with the final response, or eight weeks pass without one, you can refer the complaint to the Financial Ombudsman Service free of charge.
Frequently asked questions
Can I insure a pet with a pre-existing condition? Yes. You can insure the pet and get cover for new problems. The existing condition, and possibly related ones, will be excluded unless you choose a specialist policy that covers it.
Is a condition from before I owned the pet pre-existing? Yes, if it appears in the pet’s history before your cover started. Ask for the previous owner’s or rescue centre’s vet records when you take on a pet.
Do hereditary conditions count as pre-existing? Only if the pet had signs of them before the policy started. A condition that first appears after cover begins is normally covered, subject to the policy terms.
Is it worth insuring an older pet with health problems? It can be, because new conditions will still be covered. See insurance for older dogs and is pet insurance worth it?
Key takeaways
- Pre-existing means any sign, treatment or advice before cover started or in the waiting period, even without a diagnosis.
- Some exclusions lift after a symptom-free period of three months to two years; lifelong conditions usually don’t.
- Specialist policies exist but cost more and cover less.
- Insure early, keep cover continuous and declare everything.
New to the basics? Start with how pet insurance works in the UK.
This guide is general information, not financial advice. Always read the policy documents before you buy.