Average Dog Lifespan by Size
One of the most surprising facts about dogs is that smaller breeds generally live longer than larger ones. While most mammals show the opposite pattern (bigger = longer life), dogs are different because of how they've been bred.
Small Dogs
Under 9 kg / 20 lbs
12–16 years
Chihuahua, Toy Poodle, Yorkshire Terrier
Medium Dogs
9–22 kg / 20–50 lbs
10–14 years
Beagle, Border Collie, Cocker Spaniel
Large Dogs
22–41 kg / 50–90 lbs
10–12 years
Labrador, Golden Retriever, German Shepherd
Giant Dogs
Over 41 kg / 90 lbs
7–10 years
Great Dane, Saint Bernard, Mastiff
What affects how long a dog lives?
- 1.Size and breed — Smaller dogs live longer. Some breeds have known genetic issues that shorten lifespan.
- 2.Diet and weight — Obesity is the #1 preventable factor that shortens dog lifespan.
- 3.Exercise — Regular movement keeps joints, heart, and mind healthy.
- 4.Vet care — Annual checkups, dental care, and early disease detection extend life significantly.
- 5.Spay/neuter — Spayed/neutered dogs live slightly longer on average due to reduced cancer risk.
- 6.Genetics — Mixed breeds often outlive purebreds due to greater genetic diversity.
Average lifespan by breed
Breed averages from veterinary and kennel club records. Individual dogs vary widely, and a well-cared-for dog often beats its breed's average by years:
| Breed | Size | Average lifespan |
|---|---|---|
| Chihuahua | Small | 15–18 years |
| Toy Poodle | Small | 14–16 years |
| Yorkshire Terrier | Small | 13–16 years |
| Dachshund | Small | 12–16 years |
| Shih Tzu | Small | 12–16 years |
| Beagle | Medium | 12–15 years |
| Border Collie | Medium | 12–15 years |
| Australian Shepherd | Medium | 12–15 years |
| Cocker Spaniel | Medium | 12–15 years |
| French Bulldog | Medium | 10–12 years |
| Labrador Retriever | Large | 10–12 years |
| Golden Retriever | Large | 10–12 years |
| German Shepherd | Large | 9–13 years |
| Boxer | Large | 10–12 years |
| Rottweiler | Large | 9–10 years |
| Great Dane | Giant | 7–10 years |
| Saint Bernard | Giant | 8–10 years |
| Newfoundland | Giant | 9–10 years |
| Bernese Mountain Dog | Giant | 7–10 years |
| Mastiff | Giant | 8–10 years |
The five things that actually add years
You cannot change your dog's breed or genetics. These are the levers you do control, roughly in order of how much they matter:
- 1. Keep them lean. The lifetime labrador study found dogs kept at a lean body condition lived around two years longer than littermates fed 25% more. Nothing else on this list comes close.
- 2. Dental care. Most dogs have some dental disease by three. It is painful, it changes eating, and the bacteria involved are linked to heart and kidney damage.
- 3. Regular vet visits.Yearly for adults, twice-yearly once your dog is senior. Most of what shortens a dog's life is treatable when caught early.
- 4. Daily exercise. Joints, heart, weight and mood all depend on it — scaled to the dog in front of you, not the breed standard.
- 5. Everyday safety. Traffic, heatstroke in cars, toxic foods such as chocolate, grapes, raisins, onions and anything sweetened with xylitol. Accidents kill more young dogs than disease does.
How old is your dog right now?
Lifespan is one half of the picture. The other is where your dog sits today in human terms.
Frequently Asked Questions
Do mixed breed dogs live longer?
Yes, mixed breed dogs typically live about 1–2 years longer than purebreds of the same size. This is due to greater genetic diversity, which reduces the chance of inherited diseases.
What is the longest a dog has ever lived?
The oldest verified dog was Bobi, a Portuguese Rafeiro do Alentejo, who lived to be 31 years old (1992–2023). Most dogs live 10–14 years, with anything over 15 considered exceptional.
How can I help my dog live longer?
Maintain a healthy weight, feed quality food, ensure regular exercise, schedule annual vet checkups, keep up with dental care, and provide mental stimulation. Avoid environmental toxins and treat parasites promptly.