Most pet insurance doesn't cover pre-existing conditions—but that doesn't necessarily mean a pet with an existing health problem can't be insured. Your pet may still be eligible for coverage for new accidents and illnesses, and some insurers may cover certain curable conditions after a specified symptom- and treatment-free period.
Understanding what counts as “pre-existing” is important when comparing policies.
What is a pre-existing condition?
A pre-existing condition is generally an illness, injury or other medical issue that began before your pet insurance coverage became effective or during an applicable waiting period.
Importantly, your pet doesn't always need to have received an official diagnosis for a condition to potentially be considered pre-existing.
An insurer may look at previous signs, symptoms, veterinary advice or treatment when reviewing a claim.
For example, if your dog was limping before you bought insurance and was later diagnosed with a knee condition, the insurer may determine that the condition began before coverage started.
Can you still get pet insurance if your pet has a pre-existing condition?
Yes. Having a pre-existing condition doesn't necessarily prevent you from buying pet insurance.
Instead, the existing condition—and potentially related treatment—may be excluded from coverage.
For example, a dog with a pre-existing skin condition might still be eligible for coverage for an unrelated future accident or a new illness that develops after coverage begins.
Exactly how this works depends on the insurer and policy.
What conditions could be considered pre-existing?
Potential examples can include:
- Allergies
- Arthritis
- Diabetes
- Ear infections
- Heart conditions
- Hip or joint problems
- Skin conditions
- Cruciate ligament injuries
- Gastrointestinal problems
- Kidney disease
- Urinary conditions
Whether any particular condition is considered pre-existing depends on your pet's medical history and the insurer's policy terms.
That's why it's important not to assume that a condition is either covered or excluded based on the diagnosis alone.
What if your pet had symptoms but wasn't diagnosed?
This is an important distinction.
Suppose your dog starts limping. You visit the veterinarian, but there's no definitive diagnosis.
Two months later you buy pet insurance.
Several months after that, your dog is diagnosed with an orthopedic condition related to the earlier limping.
Even though the diagnosis happened after you bought insurance, the insurer may review the earlier veterinary records and determine that signs of the condition existed before coverage began.
In other words:
The date of diagnosis isn't necessarily the same as the date a condition began.
Can curable pre-existing conditions ever become covered?
Potentially.
Some pet insurers distinguish between curable and incurable pre-existing conditions.
Certain conditions may become eligible for future coverage after your pet has remained free from symptoms and treatment for a specified period.
For example, depending on the insurer's rules, this could potentially apply to certain temporary conditions such as an ear infection, respiratory infection or gastrointestinal issue.
Chronic or incurable conditions are generally treated differently.
The definition of “curable” and the required symptom-free period vary by insurer, so check the policy carefully.
What about chronic pre-existing conditions?
Chronic conditions generally require ongoing management and may recur throughout a pet's life.
Examples could include:
- Diabetes
- Arthritis
- Certain allergies
- Chronic kidney disease
- Some heart conditions
If a chronic condition existed before coverage began, treatment associated with it will generally be excluded.
However, your pet may still be covered for unrelated new conditions, subject to the policy terms.
Is an old ear infection a pre-existing condition?
It can be, but it isn't automatically excluded forever under every policy.
This is a good example of why insurers' approaches to pre-existing conditions matter.
If your pet had an ear infection before enrollment, an insurer may initially consider subsequent related treatment pre-existing.
Some insurers may reconsider certain curable conditions after a defined period without symptoms or treatment, while others may apply different rules.
If your pet has a history of recurring ear infections, allergies or skin problems, compare how different insurers handle those conditions before choosing a policy.
Are bilateral conditions considered pre-existing?
This can be particularly important for orthopedic conditions.
A bilateral condition is one that can affect both sides of the body—for example, the knees or hips.
Depending on the policy, if your dog experienced a cruciate ligament problem in one knee before coverage began, a later problem with the other knee could potentially be treated as related and excluded.
Rules around bilateral conditions vary, so this is worth checking carefully if your pet has an orthopedic history.
Will the insurer check your pet's medical records?
Pet insurers may request veterinary records when you enroll or when you submit a claim.
These records can help establish whether signs, symptoms or treatment relating to a condition occurred before coverage became effective.
That can include records from previous veterinarians as well as your pet's current veterinary practice.
Providing accurate information about your pet's medical history is important when applying for coverage.
What if you switch pet insurance companies?
Be careful when switching insurers.
A condition covered under your existing policy could potentially be considered pre-existing when you start a new policy because the new insurer will generally assess your pet's medical history based on its own policy terms.
This means switching to a cheaper insurer isn't always financially beneficial if your pet has developed medical conditions since you purchased the original policy.
Compare the potential savings against any coverage you could lose before cancelling an existing plan.
Should you get pet insurance before your pet develops a health problem?
This is one of the strongest arguments for considering pet insurance while your pet is young and healthy.
Pet insurance is primarily designed to protect against future unexpected accidents and illnesses, not conditions that have already developed.
Buying coverage before symptoms appear can reduce the likelihood that future medical problems will be excluded as pre-existing.
Waiting until your pet becomes sick and then purchasing insurance generally won't provide coverage for that existing illness.
What should you look for when comparing policies?
If your pet has any previous health issues, don't compare policies based on price alone.
Look closely at:
- How the insurer defines a pre-existing condition
- Whether symptoms without a diagnosis can count
- How curable pre-existing conditions are handled
- Any required symptom- and treatment-free period
- Rules concerning bilateral conditions
- Waiting periods
- Coverage for hereditary and congenital conditions
- Whether a medical-record review is available
- Other exclusions that could affect your pet
Small differences in policy wording can potentially make a big difference to future coverage.
Find pet insurance when your pet has a medical history.
A previous medical problem doesn't necessarily mean there's no value in getting pet insurance.
Your pet may still be eligible for protection against new and unrelated accidents and illnesses, while some insurers may offer more favorable treatment of certain curable pre-existing conditions than others.
Comparing policies can help you understand what's potentially covered, what's excluded and which option is the best fit for your pet's medical history.
Pre-existing condition definitions and coverage vary by insurer and policy. A condition may be considered pre-existing based on signs or symptoms that occurred before coverage began, even without a formal diagnosis. Some insurers may reconsider certain curable conditions after specified periods. Always review the individual policy terms and exclusions.

