Why Are Dogs’ Lifespans Getting Shorter?

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I have always believed that our dogs’ lives are far too short as it is. That is why I have promised myself to do everything within my power for their well-being. If the day comes when I must make a difficult decision, my dog’s quality of life must come first, not my wish to keep them with me a little longer.

Years ago, I came across Dr Karen Shaw Becker’s discussion of two studies. One compared health data for pedigree dogs in the United Kingdom; the other examined whether mixed-breed dogs are better protected against inherited diseases. Those studies made me wonder whether dogs really are living shorter lives and how much their health depends on the choices we make. Looking at more recent evidence, the answer is more interesting than the original headline might suggest.

Are dogs really living shorter lives?

In the UK Kennel Club’s 2004 pedigree dog health survey, the median age at death of 15,881 dogs was 11 years and 3 months. In the survey conducted ten years later, the median age at death of 5,663 dogs was 10 years and 4 months. At first glance, it looks as though the lifespan of pedigree dogs fell by nearly a year in a decade.

But there is an important catch. The Kennel Club itself stresses that the 2004 and 2014 surveys used different methodologies. The first reached owners mainly through breed clubs, while the second was distributed much more widely, including to dog owners outside those clubs. The number and composition of respondents also differed. We therefore cannot interpret the difference between these figures as proof that dogs’ lifespans in the UK actually declined over that decade.

In other words, the surveys produced different figures, but we do not know how much of that difference reflects a real change in longevity and how much stems from the different samples. These data do not justify claiming that dogs’ lifespans decrease by a fixed percentage every ten years.

What do newer, larger studies show?

In 2024, the journal Scientific Reports published a British study analysing data from 584,734 dogs, including 284,734 deceased animals. The median survival in this dataset was 12.5 years. Although it is a large dataset, it still cannot be used to conclude simply that dogs now live longer than before: the population studied and the data-collection methods differ from those of the older surveys.

A 2022 VetCompass study, based on records from UK primary-care veterinary practices, estimated life expectancy at birth at 11.23 years. These are not the same measures. One is the median survival of dogs in a particular dataset; the other is life expectancy at birth estimated using a life table. Comparing the numbers without accounting for methodology would be misleading.

What these studies do clearly demonstrate is that there are substantial differences between groups of dogs. Longevity is not determined by the calendar year alone. Breed, body size, conformation, inherited disease risks and various environmental and care-related factors all play a part.

Breed, size and body shape affect longevity

In the 2024 study, median survival was 12.7 years for smaller pedigree breeds, 12.5 years for medium-sized breeds and 11.9 years for large breeds. Skull shape was also associated with differences: several short-muzzled breeds had lower figures than dogs with a more typical muzzle shape. For example, median survival in the dataset was 9.8 years for the French Bulldog and 13.1 years for the Labrador Retriever.

These are population-level estimates, not predictions of an individual dog’s fate. A German Shepherd does not have to die on some statistically determined birthday, and a small dog is not guaranteed a long life. Nevertheless, such data are useful when making breeding decisions, planning breed-specific health screening and organising preventive care.

It is especially important to consider whether breeding has favoured certain physical traits at the expense of canine health. An extremely short muzzle, breathing problems or severe joint disorders are not merely questions of appearance. At the same time, health risks cannot be assessed on the basis of a single visible trait alone.

Are mixed-breed dogs healthier than purebred dogs?

A common assumption is that combining several breeds automatically produces a healthier dog. Increased genetic diversity can indeed have advantages, especially for certain recessively inherited disorders. But being mixed-breed does not rule out disease, just as being purebred does not automatically mean being ill.

A 2013 study from the University of California, Davis compared diagnoses associated with 24 inherited disorders in purebred and mixed-breed dogs. No statistically significant difference was found for thirteen of the disorders. Ten were more common in purebred dogs, including dilated cardiomyopathy, elbow dysplasia, cataracts and hypothyroidism. One condition, cranial cruciate ligament rupture, was more common in mixed-breed dogs.

This does not mean that every purebred dog is as healthy as every mixed-breed dog. The study examined selected conditions in patients at a university veterinary hospital, and its findings vary by diagnosis. Nor does the frequency of any one disorder establish a dog’s overall health or lifespan.

The 2024 British longevity study also presented a nuanced picture. In that dataset, median survival was 12.7 years for pedigree dogs and 12.0 years for mixed-breed dogs. However, this difference cannot automatically be taken as evidence that being purebred extends life: the groups had very different compositions, with variation in size, background, health risks and other factors.

For me, the key lesson is that we should look at the risks of the individual dog and its family line, rather than relying solely on the label ‘purebred’ or ‘mixed-breed’.

What can we do to help dogs live healthier and, where possible, longer lives?

Body condition and food portions

Body condition is one of the better-studied factors we can influence. In a classic long-term experiment, researchers followed 48 Labrador Retrievers. The group fed a restricted amount had a median lifespan of 13.0 years, compared with 11.2 years in the control group. This was a particular trial involving one breed; it does not mean that every owner should independently reduce their dog’s food allowance by a quarter.

In a 2019 observational study based on data from more than 50,000 neutered dogs, overweight status was associated with a shorter lifespan in all twelve breeds studied. The difference ranged from roughly five months to two and a half years. An observational study cannot establish causation on its own, but its findings are consistent with the direction seen in the controlled feeding experiment.

It therefore makes sense to assess body condition and muscle mass alongside the number on the scales. An ideal condition cannot be determined simply by whether a dog looks sturdy or slim. The ribs should be easy to feel beneath a thin layer of fat, the waist should be visible, and muscle condition should be appropriate for the dog’s age and health.

A balanced diet, not worshipping one ingredient

When it comes to food, the question should not be limited to whether a dog eats kibble, wet food, home-prepared food or raw food. What matters more is whether the overall diet provides the necessary nutrients in suitable amounts, is safe and agrees with the dog. FEDIAF’s 2025 Nutritional Guidelines offer a practical framework for assessing the nutrient balance of complete pet foods in Europe.

Fresh and less processed ingredients can have a place in a carefully planned diet and an integrative approach. However, we cannot currently claim that one particular feeding method extends every dog’s life. Equally, a diet does not become balanced simply because all its ingredients are natural. If you combine different foods, consider the whole daily ration, not just the ingredients in a single meal.

For more on keeping the daily diet balanced when combining different types of food, see my FendaF article “Combining Different Dog Foods: Dry, Wet and Raw”.

Exercise, sleep, environment and social well-being

Regular, age-appropriate exercise helps maintain muscle, joint mobility and body condition. Activity needs to be adapted to the dog’s age, breed and health, because the right level of exertion for an older dog with heart disease is not the same as for a healthy young dog. Sniffing, calm exploration and opportunities for adequate rest are valuable too.

A 2023 Dog Aging Project questionnaire study found an association between stronger social support and better owner-reported health. This does not prove that getting a second dog automatically extends lifespan, but it reminds us that health is about more than food and medicines. A safe environment, appropriate social interaction, mental enrichment and a predictable daily routine are also part of a dog’s well-being.

Prevention and noticing health changes early

As dogs age, regular health checks, dental and oral health, joint and heart health, weight and muscle mass become particularly important. The AAHA Canine Life Stage Guidelines recommend veterinary check-ups at least twice a year for senior dogs, with examinations tailored to individual risks. Vaccination and parasite prevention should be planned with a veterinarian, considering the dog’s age, previous protection, environment and exposure risk.

Knowing breed-specific risks helps determine when it may be useful to examine the heart, joints, eyes or other organ systems. This does not mean that every healthy dog needs every possible test annually. The important thing is to notice changes in appetite, thirst, movement, weight, breathing and usual behaviour, and to seek help in good time when necessary.

An integrative perspective: the whole matters more than a miracle cure

What I appreciate about an integrative approach is the idea that a dog should not be viewed solely through a diagnosis. Nutrition, exercise, pain, digestion, sleep, environment, relationships and medication all affect one another. That does not mean every alternative intervention has been proven effective, nor that the benefits of supportive habits disappear if we do not yet have an ideal long-term trial for them.

In practice, this means holding two ideas together. First, we make appropriate use of well-studied measures, such as maintaining suitable body condition, providing a balanced diet, using vaccination and parasite prevention according to individual needs, and diagnosing illness early. Second, we remain open to complementary approaches, including physiotherapy, environmental adjustments or carefully selected supplements, while assessing their suitability for the individual dog and monitoring adverse effects and interactions. A supplement should not be considered proven effective simply because it is natural.

If a dog has already been diagnosed with heart disease, cancer or another serious condition, a carefully adapted diet and supportive care may help them feel better. These measures should not replace treatment with demonstrated benefits for that condition. Sometimes our most important aim is not to extend life in numbers, but to make the time the dog has better.

In conclusion

Based on today’s evidence, we cannot claim that all dogs’ lifespans are declining at a fixed rate. A simple comparison of the older British surveys would be misleading. We do, however, have increasingly good data about why some breeds and dogs tend to have shorter lives, and which risks we may be able to reduce.

We cannot control everything. Genetics cannot be rewritten after a dog is born, and even the most caring owner cannot prevent every illness. But how we feed our dogs, monitor their body condition, exercise with them, respond to their pain and notice changes in their health really is in our hands.

I do not know how many days or years my choices might add to one dog’s life or another’s. I only know that if I can make their life better by even a single day, the effort is worth it to me.

Sources

• The Royal Kennel Club, 2004. Pedigree dog health survey
• The Royal Kennel Club, 2014. Pedigree breed health survey and comparison limitations
• McMillan et al., 2024. Longevity of companion dog breeds. Scientific Reports
• Teng et al., 2022. Life tables of annual life expectancy and mortality for companion dogs in the UK
• Bellumori et al., 2013. Prevalence of inherited disorders among mixed-breed and purebred dogs
• Kealy et al., 2002. Effects of diet restriction on life span and age-related changes in dogs
• Salt et al., 2019. Association between life span and body condition in neutered client-owned dogs
• Dog Aging Project, 2023. Social determinants of health and disease in companion dogs
• FEDIAF, 2025. Nutritional Guidelines for Complete and Complementary Pet Food for Cats and Dogs
• AAHA, 2019. Canine Life Stage Guidelines

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