Why your pet's premium climbs every year — even with zero claims
It isn't a penalty for filing claims. Your pet's age is one of the largest rating factors in the policy, and the yearly increase is written into the filing the day you sign up.
A common and reasonable assumption: "I never filed a claim, so why did my pet's premium go up?" The answer is that, in pet insurance, the single biggest driver of your renewal price usually isn't your claims history at all. It's the fact that your pet got a year older.
Pet insurance is re-priced every year on age
These are annually renewable policies. Each year the insurer re-rates the premium, and one of the largest inputs is the pet's attained age. Older animals cost more to insure for the same reason older anything costs more to insure: claims get both more frequent and more expensive. Chronic conditions, cancer, kidney and heart disease — the costly stuff skews heavily toward the back half of a pet's life.
Insurers encode this in what's effectively an aging curve: a table of age factors that multiply the base rate. A dog insured at age one might sit at a factor of 1.0; by age ten that same dog can be at 3x or 4x — meaning the age component alone has tripled or quadrupled the premium, before any other change.
And the aging curve stacks on top of general increases
Here's the part that surprises people. The aging curve is separate from the company-wide rate changes an insurer files with regulators. Your actual renewal is roughly the product of the two: the new base rate (which may itself have gone up several percent across the whole book) multiplied by your now-higher age factor. A "modest 6% rate filing" can land as a much larger increase on an aging pet whose age factor also stepped up that year.
Why this should change how you shop
A cheap puppy quote can hide a steep aging curve. Two carriers that look nearly identical when your dog is one year old can diverge dramatically by age eight, because their age factors climb at different rates. The intro price tells you almost nothing about what you'll pay over the animal's life — which is exactly when you're most likely to actually need the coverage.
So compare the curve, not the first bill. You can see how different carriers' age factors climb in the aging factors tool, and chart the full lifetime premium for a specific breed and ZIP in the premium calculator. The carrier with the lowest year-one price is frequently not the one with the lowest year-ten price.