RVC study finds giant dog breeds live shorter lives with higher disease burden

Research from the Royal Veterinary College's VetCompass programme, drawing on anonymised veterinary records from UK primary-care practices, has examined the health and longevity of giant dog breeds — those with an average adult bodyweight above 45kg, including Great Danes, Irish Wolfhounds and Saint Bernards. Among the giant dogs identified in the dataset, average lifespan came out at 8.9 years, more than three years shorter than the average previously reported for dogs overall in England.

The study also found that 73.8 per cent of giant dogs had at least one disorder recorded in a given year, compared with 65.8 per cent across all dog breeds. The most common conditions included ear infections, being overweight, and aggression, while cancer was identified as the leading cause of death. The researchers linked the pattern to more rapid growth and ageing associated with very large body size, echoing findings reported in giant breeds internationally.

For anyone considering a giant breed, or already living with one, the findings are a useful prompt to plan ahead: weight management, joint and ear care, and early veterinary attention to lumps or behavioural changes can all help manage the risks these breeds face. For breeders, the study adds to a growing body of evidence on how selecting for exaggerated size can carry a welfare cost, and reinforces the case for weighing longevity and disease risk alongside appearance when making breeding decisions.