Evidence-based dog longevity

How long will your dog live, and what can you do about it?

Lifespan data for 277 breeds, calculators built on studies of over 580,000 dogs, and senior care guides that say what the evidence supports. Start with your breed.

Mixed breed? Try the lifespan calculator by size.

Illustration of a person crouching beside their dog on a grassy hill at golden hour
Median dog lifespan
12.5 yr
584,734 UK dogs, 2024
Overweight penalty
−2.5 yr
up to, 12 breeds, 50,000 dogs
Lean-fed Labradors
+1.8 yr
14-year lifetime study
Flat-faced breeds
11.2 yr
vs 12.8 medium-muzzled

Start with your breed

All 277 breeds →

Typical lifespan, the age each breed becomes a senior, the conditions that shorten its life and what to do about them.

The questions owners ask most, answered by age and size, each with its own page.

Every formula cites its study. Nothing is stored and there is nothing to sign up for.

What actually changes how long a dog lives

Three things explain most of the difference between a dog that reaches eight and one that reaches fifteen.

0 4 8 12 Small 12.7 yr Medium 12.5 yr Large 11.9 yr Medium muzzle 12.8 yr Long muzzle 12.1 yr Flat face 11.2 yr Median lifespan in years · McMillan et al. 2024, 584,734 UK dogs

Size sets the clock

Small breeds reach a 12.7-year median, large breeds 11.9, and the shortest-lived breeds are all giants, from the Caucasian Shepherd at 5.4 years to the St Bernard at 9.3.

How long do dogs live →

Weight is the lever you hold

Overweight dogs lived 5 months to 2.5 years less across 12 breeds. Lean-fed Labradors lived 1.8 years longer and developed arthritis two years later.

Check body condition →

The senior years decide the rest

Senior begins in the last quarter of expected lifespan. Six-monthly exams, dental care and pain control are where healthy years are won or lost.

Senior care guides →

Senior dog care

All guides →

Insure before something is in the record

Pet insurance excludes anything diagnosed before enrollment. For breeds with expensive hereditary conditions, the cheapest policy is the one bought while the dog is young and healthy.

Embrace Pet Insurance

Accident and illness cover with an optional wellness rewards plan for routine care such as dental cleanings and bloodwork.

Get an Embrace quote

Lemonade Pet

App-first insurer with fast claims and add-ons for vet visit fees, dental illness, and physical therapy.

Get a Lemonade quote

Tailyears is reader-supported. Some links on this page are affiliate links: if you buy or get a quote through them we may earn a commission at no extra cost to you. This never changes what we recommend, and it never replaces advice from your veterinarian.

How Tailyears works

Breed sizes, weights and life expectancy ranges come from AKC breed data. Population lifespans come from two UK studies: VetCompass life tables (Teng 2022, 30,563 dogs) and McMillan et al. 2024 (584,734 dogs, 155 breeds). Lifestyle effects come from Salt 2019, Kealy 2002 and Hoffman 2013. Health watchlists are curated from breed club surveys and the veterinary literature for 110 breeds and size-based for the rest. Breed photographs come from Wikimedia Commons and are credited on each page. Full methodology and sources.