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Explainer

Pre-existing conditions in pet insurance.

A pre-existing condition is any condition your pet has shown signs of, been investigated for, or received treatment for before the policy started — including during the waiting period. Most are permanently excluded from cover. Three brands in our directory offer documented pathways to remove some pre-existing exclusions after a defined symptom-free period; the rest treat any prior vet-noted symptom as a permanent block. This is the single most consequential PDS provision for older pets and pets with any vet history.

J By Jarrod, Editor · Reviewed May 2026 · ~5 min read

What actually counts as pre-existing

The PDS definition of "pre-existing condition" in Australian pet insurance is broader than most buyers expect. It typically covers any of the following before the policy commencement date or during the waiting period:

• A diagnosed condition your vet has identified by name (osteoarthritis, hyperthyroidism, atopic dermatitis, etc.)
• Symptoms or signs that have been observed and noted in vet records, even if no diagnosis was reached (limping, recurring vomiting, intermittent skin irritation, etc.)
• Conditions investigated but unresolved — even a clinical examination noted as "investigation: no diagnosis reached" can sometimes be cited as evidence of a pre-existing condition if a related condition emerges later
• Conditions you knew about but hadn't yet seen the vet for — if you suspected something and didn't disclose it at policy application, claims for that condition can be denied as pre-existing
• Bilateral counterparts of pre-existing conditions — see the bilateral condition section below

The PDS standard isn't "had a diagnosis" — it's "had any sign or symptom in the historical record." This is why pet insurers ask for vet records during claim assessment and why insuring a pet with a thick health history is structurally harder than insuring a young pet with a clean record.

The two pre-existing exclusion models

Pet insurers split into two camps on how strictly they apply the pre-existing rule:

Symptoms-based exclusion (the standard model)

Any symptom in the vet record before policy commencement is enough to exclude the underlying condition (and any related conditions) from cover. This is the default approach used by most Australian pet insurers — Knose, Pet Circle Insurance, Petsy, PetsOnMe, Coles, and most other reviewed brands operate this model. There is no formal pathway to remove the exclusion; the condition stays excluded for the life of the policy.

Symptoms-based with a temporary condition review pathway

Same starting point — any prior symptom triggers the exclusion — but the brand offers an explicit mechanism to remove the exclusion for some condition categories if your pet has been symptom-free for a defined period. Three brands in our verified directory operate this model:

• Bow Wow Meow — 18-month symptom-free review for "temporary conditions". Your vet certifies that your pet has been symptom-free of the previously-noted condition for 18 months, BWM reviews and (if approved) removes the exclusion. Permanent or chronic conditions can't be reviewed.
• RSPCA PetFlex — Temporary Conditions framework written into the current PDS Section. Specific conditions listed as "Temporary Conditions" can be removed from exclusion after the defined symptom-free period. Permanent conditions stay excluded.
• Pet Insurance Australia — operates a similar temporary condition mechanism per the current PDS. Same general structure as BWM.

The review pathway only applies to genuinely temporary or acute conditions (a short illness, an injury that healed, a one-off allergic reaction) — not to chronic disease, hereditary conditions, or progressive conditions like degenerative joint disease. The pathway is most useful for the specific case of an otherwise-healthy pet with a single previously-resolved condition that the buyer wants restored to cover.

Bilateral conditions — the rule most buyers miss

A "bilateral condition" is one that affects paired body parts: knees (cruciate ligaments), hips (dysplasia), ears (otitis), eyes (cataracts), and others. Most Australian pet insurance PDSs treat a pre-existing condition on one side as also excluding the other side — even if the other side has never shown symptoms.

The most-cited example: cruciate ligament rupture. Cruciate disease in dogs is bilateral roughly 40–60% of the time over a 1–3 year window. If your dog ruptured their left cruciate before policy commencement, the right cruciate is also pre-existing under standard bilateral condition rules — even though it might not rupture for another two years. A claim for the right-cruciate surgery in year three of the policy would still be denied as pre-existing under most brands' PDS.

All brands in our verified directory apply some form of bilateral condition rule. The exact wording varies — some PDSs use the term "Bilateral Condition" explicitly with a defined list, others fold it into the general pre-existing exclusion language. Read your brand's PDS Bilateral Condition section before assuming any prior unilateral condition only excludes one side.

Pre-existing handling at each AU pet insurer

What to do with this information

If your pet has any vet history, three rules of thumb:

1. Disclose everything at application. Brands ask for vet records anyway during claim assessment. Non-disclosure of a known condition is cited as fraud or non-disclosure depending on the policy and can void the entire cover, not just the affected condition. The cleanest route is full disclosure at signup so the exclusion list is documented up front.
2. Pick a brand with a documented review pathway if your pet's record has any temporary conditions you'd want re-covered later. BWM, RSPCA PetFlex, or PIA. The review pathway is structurally a much better fit than choosing a cheaper brand without one and hoping for the best on individual claims.
3. Consider waiting periods for known conditions. Even a brand with a review pathway will require a clean period before reconsidering an exclusion. If you know your pet had a temporary condition that resolved, signing up promptly and waiting out the symptom-free window puts you in the best position to have that exclusion lifted later.

This article is general information based on publicly available data. It doesn't constitute personal financial advice and isn't a recommendation about any particular pet insurance product. Pre-existing condition definitions, review pathways, and bilateral condition rules vary between brands and change between PDS revisions — always read the current Product Disclosure Statement before purchasing. Published 1 May 2026.