Pet policies are described by three numbers: a deductible, a reimbursement percentage and an annual limit. They interact in an order that determines what a large claim actually pays.
The deductible comes off first
Most policies apply an annual deductible, satisfied once per policy year across every condition the animal develops.
Per-condition deductibles also exist, resetting for each new condition rather than each year, which suits a different pattern of claims.
Only eligible costs count toward it, so excluded items and some consultation fees may not reduce it at all.
The deductible type matters more for a chronic condition than the deductible amount does.
The percentage applies to what remains
After the deductible is met, the insurer pays a stated share of eligible costs and the owner pays the balance.
A lower percentage lowers the premium and raises the owner's share on every claim, which compounds sharply on expensive treatment.
The owner's share of a major surgery can exceed the annual premium several times over.
The percentage is chosen at purchase and can usually be changed at renewal, which makes it the easiest lever if a premium becomes uncomfortable.
The annual limit caps everything above it
Once total payments reach the annual limit, the policy stops paying until the next policy year begins.
Per-condition and lifetime limits work differently, capping a single diagnosis rather than a year, and a chronic condition can exhaust one within a few years.
Unlimited annual policies avoid that, and they cost more precisely because nothing constrains the tail.
For a long-running condition, the limit structure matters considerably more than the reimbursement percentage.
Eligible cost is narrower than the invoice
Policies exclude items such as preventive care, prescription diets and sometimes examination fees, and those are removed before any calculation begins.
Some insurers apply benefit schedules capping what they consider reasonable for a given procedure regardless of what was charged.
Comparing policies on the three headline numbers misses this, and it is where quoted cover diverges from actual reimbursement.
Reading the exclusions list alongside the numbers is what shows whether the percentage will be applied to most of an invoice or to part of it.
Payment happens after the owner has paid
Most pet policies reimburse rather than paying the practice directly, so the owner funds the treatment and claims afterwards.
Direct payment arrangements exist between some practices and some insurers, and they change the cash position entirely on a large claim.
An owner buying a policy for the worst case benefits from knowing which of the two applies before that case arrives.