Senior Pet Statistics USA

More than half of America's pet-owning households now care for at least one senior dog or cat — and as veterinary guidelines vary on exactly when a pet becomes “senior,” so does the data. Here's what the most consistent sources say about how many senior pets there are, when pets typically reach senior status, and what health issues become more common as they age.

How Many Senior Dogs and Cats Are There in the U.S.?

According to AVMA data, at least 28% of U.S. dogs and more than 25% of U.S. cats are age 8 or older. A separate, peer-reviewed estimate on pet aging puts 20–40% of the overall pet population as "old" — typically defined as over 11 years — with one cited study finding almost half of pet cats are over age 7.

Freedonia Group's analysis of Packaged Facts' pet ownership survey data found the share of dog-owning households with a senior dog rose from 41.6% in 2012 to 53.5% in 2022, and the share of cat-owning households with a senior cat rose from 46% to 52% over the same period — a larger jump for dogs than cats. In combination, 58% of all dog- or cat-owning households currently have at least one senior pet (age 7+).

At What Age Is a Pet Considered "Senior"?

There's no single agreed-upon threshold. AVMA generally treats cats and small dogs as senior starting around 7 years old, though other veterinary guidelines put small-to-medium dog breeds at 8–11 years and reserve full "senior" classification for cats at 10+. Larger dog breeds are typically considered senior earlier — often 6–7 years — because bigger breeds tend to have shorter lifespans. Because "senior" is defined differently across sources (by fixed age, by breed size, or by the last quarter of a breed's expected lifespan), statistics from different organizations aren't always measuring the same thing.

What Health Conditions Are Most Common in Senior Pets?

Arthritis (osteoarthritis) is one of the most widely recognized conditions in aging dogs and cats. A peer-reviewed study of dogs under primary veterinary care in the UK found an annual diagnosed period prevalence of 2.5% (roughly 200,000 affected dogs in that population per year), with age over 8 identified as a significant risk factor for diagnosis. That formally diagnosed rate is lower than the "up to 80% of senior dogs have some degree of arthritis" figure commonly cited in clinical and consumer sources — a gap that likely reflects underdiagnosis of milder joint pain rather than the condition being rare. Kidney disease is also widely recognized as common in senior cats specifically, though we did not find a rigorously sourced national prevalence percentage to cite here.

The Big Picture

More than half of U.S. pet-owning households care for a senior dog or cat, and that share has been rising for at least a decade, per Freedonia's analysis. But "senior" statistics are unusually inconsistent across sources because there's no single age threshold everyone uses — AVMA, breed-size guidelines, and individual studies all define it differently. We've cited each source's specific definition and flagged where we couldn't independently verify a figure, rather than presenting a false sense of precision.