Giant Breeds: What the UK Records Show About Health and Lifespan
Giant-breed dogs in a UK study lived a median of 8.94 years. What the records show about their common problems and causes of death, and what they don't.
Written by thecanineledger
This page carries no advertising, and nothing on it is for sale.
A 2026 study of UK vet records found that “Among 1,068 giant breed dogs recorded as having died, the median age at death was 8.94 years” (O’Neill et al., Companion Animal Health and Genetics 2026). The authors compare this with a median of 12.0 years in an earlier study of dogs overall in England.
While a giant dog can live well into double figures, the typical lifespan is shorter. This page sets out what the records show, breed by breed where the numbers allow.
1. The study
The dogs. Researchers used VetCompass, a database of anonymised UK primary-care records. Of 2,250,417 dogs under care in 2019, 28,345 were from 29 giant breeds, or 1.26%.
What counts as giant. There is no fixed list. The authors note a “tacit agreement that breeds with a typical adult bodyweight greater than 45 kg (99 lbs) are considered as giant”. Their list reflects their own judgement.
The most common. “The most common giant breeds were Dogue de Bordeaux, Alaskan Malamute and Akita.”
Funding. The work was supported by the Kennel Club Charitable Trust and a pet insurer.
2. Lifespan by breed
The overall figure hides wide gaps between breeds. Median age at death for breeds with at least 50 recorded deaths:
| Breed | Deaths recorded | Median age at death (years) |
|---|---|---|
| Akita | 74 | 11.3 |
| Alaskan Malamute | 136 | 11.2 |
| Newfoundland | 70 | 10.3 |
| Mastiff | 56 | 9.64 |
| Bull Mastiff | 85 | 9.09 |
| Great Dane | 113 | 8.90 |
| Dogue de Bordeaux | 229 | 7.71 |
| Bernese Mountain Dog | 63 | 7.7 |
| Saint Bernard | 64 | 6.76 |
Mastiff types. The mastiff-type breeds lived a median of 8.42 years, against 9.97 years for the other giant breeds. They were also heavier, and the authors suggest weight may explain much of the gap.
Our note: The 12.0-year figure for all dogs comes from a different study and period, so the comparison is rough.
3. What they died of
A cause was often missing. “A biomedical cause of death was reported for 597 (55.9%) deaths.”
The commonest causes. Among all deaths, cancer was the most common recorded cause, at 12.4%. Collapse came next, at 9.46%, then heart disorders, at 4.12%.
Our note: “Collapse” is a broad category. This study doesn’t report bloat.
4. What they saw the vet for
Most had something. “Overall, 73.8% of giant breed dogs had at least one disorder recorded during 2019.”
The commonest problems. Ear infections, at 8.16%, being overweight, at 8.02%, and aggression, at 5.56%. By group, skin, joint and muscle, and ear problems led.
Many are not size-specific. The authors note that four of the five most common problems were the same as in dogs of all types. Dental disease was less common in giant dogs than in dogs overall.
Aggression, with care. The authors say other research “does not show higher absolute probability of aggression in giant breeds compared to smaller-sized dogs, but the implications from aggression for the dogs and their in-contact humans do seem higher for giant breed dogs”. A record of aggression in a vet’s notes isn’t the same as a dog that bites.
Our note: The aggression figure may reflect what vets choose to record. It doesn’t show that giant dogs are more likely to bite.
5. What it doesn’t show
- Severity. Each problem was counted as present or not, with no sense of how bad it was.
- Missed problems. The records depend on what each vet wrote down, so the authors say they may underestimate disease.
- Why. Records show patterns, not causes.
The authors’ view. “These findings suggest value from considering setting international welfare-based limits for height and bodyweight exaggerations selected in giant dogs.”
6. If you’re thinking about a giant breed
- Plan for a shorter life, and look at the figure for the breed you want.
- Plan for size, including the cost of medicines and care for a heavy dog.
- Ask a breeder how long related dogs lived, and what they died of.
Our note: These points are ours.
→ Choosing a Breed or a Mix: The Health Data Breeders Don’t Lead With · → Breed and Lifespan: What the UK Primary-Care Data Shows
7. What we could not verify
| Commonly said | What we found |
|---|---|
| “Giant dogs live about eight years” | Varies by breed. The median was 8.94 years overall, from 6.76 to 11.3 years in breeds with enough deaths. |
| “Giant dogs are more aggressive” | Not shown. Aggression was recorded often, but the authors say other research doesn’t show a higher chance in giant breeds. |
| “Most giant dogs die of cancer” | Not in these records. Cancer was the top recorded cause, at 12.4% of deaths. Many deaths had no cause recorded. |
Sources
- O’Neill DG, Curtis TJ, York GOJ, et al. Giant dog breeds under primary veterinary care in the UK: demography, common disorders and mortality. Companion Anim Health Genet 2026: VetCompass study, 28,345 giant-breed dogs in 2019. Supported by the Kennel Club Charitable Trust and a pet insurer
Always confirm with your vet before acting on anything on this page.