What counts as pre-existing
A pre-existing condition is a health problem that was diagnosed, treated, or showed clinical signs before your policy took effect or before the waiting period ended. The policy’s own definition is the one that applies.
Curable conditions
Some insurers treat conditions they consider curable, such as certain infections, differently after the pet has been symptom-free for a set time. Others do not. Confirm this in writing before relying on it.
How insurers check
When you file a claim, the insurer may ask for your pet’s full medical records to determine whether the condition existed before coverage. Some insurers also ask for an exam before enrollment.
What this means for timing
Because new coverage only applies to new conditions, enrolling while your pet is young and healthy generally preserves the most options.
Sources and further reading
This guide explains general industry practice. For the terms that apply to you, rely on the policy documents from each insurer you consider and on the consumer resources published by your state insurance department.