How long do dogs live? Life expectancy by size and how to add years

How long dogs live on average

If you need one number, the most common is 10 to 13 years. But it's only an average: some dogs don't reach 8 and others pass 18. Size, breed, genetics, diet, weight and veterinary care all matter. The longest-lived dog on record, widely accepted, reached 29, but that's an extremely rare exception and not a useful benchmark.

Life expectancy by size

As a guide, these are the figures usually quoted:

• Small dogs (Chihuahua, Yorkshire terrier, toy poodle): 12 to 16 years, and some live longer.
• Medium dogs (beagle, cocker spaniel, border collie): 10 to 13 years.
• Large dogs (Labrador, German shepherd, golden retriever): 8 to 12 years.
• Giant dogs (Great Dane, mastiff, Saint Bernard): 6 to 10 years.

These are general estimates, not a promise. To see what life stage your dog is in, use our human age calculator.

Why do large dogs live shorter lives?

It's one of biology's oddities: among species, larger animals usually live longer, but among dogs the opposite is true. Scientists think large dogs grow so quickly that their bodies age sooner, and that they face more risk of certain problems, like tumors and heart and joint disease. That's why an 8-year-old Great Dane is already a very old dog, while a Chihuahua of the same age is still an active adult.

Do mixed breeds live longer?

It's often said that mixed-breed dogs outlive purebreds. Some studies suggest a difference exists, but it's small, and size still matters more than breed. A large mixed breed won't live as long as a small one. What matters is knowing your dog's needs and caring for it well.

What you can do for a longer, better life

Some things really are up to you, and the biggest is weight. A 14-year study of Labradors compared dogs fed freely with others fed about 25% less: the leaner dogs lived close to two years longer on average and developed chronic problems later. These are the habits that help most:

• Keep it lean. Measure its food and check its weight with the ideal weight tool. Read how to tell if your dog is overweight.
• Give it age-appropriate exercise. Work it out with the walk planner.
• Care for its teeth. Dental disease is very common and painful. Brush a few times a week.
• Keep vaccines and parasite prevention current with the vaccine record.
• Schedule checkups once a year, and every six months for seniors.
• Give it mental stimulation: sniffing games, new tricks and company.
• Avoid hazards: toxic food, extreme heat, cars and escapes. A QR tag helps if it gets lost.

Signs your dog is getting older

Gray around the muzzle, more sleep, stiffness when getting up, less interest in running, cloudy eyes or hearing loss are normal signs of aging. Others, like drinking much more, losing weight for no reason, coughing, lumps or confusion at night, shouldn't be written off as age without checking. Many illnesses in older dogs are treatable and can restore quality of life.

More important than years: quality of life

As a dog ages, the goal isn't only to add years but to make them comfortable. Soft beds, ramps, shorter but more frequent walks, adapted food and pain control make an enormous difference. Talk to your vet about its wellbeing at every checkup.

Frequently asked questions

Which dog breed lives the longest? Usually small breeds like Chihuahuas, poodles and Yorkshire terriers, and many small mixed breeds.

At what age is a dog considered old? It depends on size. Giant breeds from about 6; small breeds around 9 or 10.

Does spaying or neutering extend life? Some studies link it to longer life, but it depends on breed and timing. Discuss it with your vet.

This article is for information only and does not replace a visit to your vet.