Can We Help Our Dogs Live Longer?

A dog turns ten and the arithmetic becomes difficult to ignore. The walks may still be long, dinner may still disappear in seconds and the arrival of a favourite person may still cause complete chaos, but time has begun to feel different.

Scientists are now asking whether that time can be extended. Not simply by treating cancer, heart disease or arthritis once they appear, but by intervening in the ageing process itself. It is an extraordinary prospect, and one that has moved beyond theory. Clinical trials involving pet dogs are already under way.

There is no proven longevity drug waiting at the veterinary practice, however. Nor is there a supplement, diet or routine that can guarantee an unusually long life. What we have instead is a growing body of evidence about the factors associated with canine health and survival. Some were decided before a dog was born. Others are shaped, at least partly, by how that dog lives.

The attempt to treat ageing

Most veterinary medicine responds to a particular problem. An infection is treated with antibiotics. Pain is managed. A tumour is removed or targeted with chemotherapy. Longevity research starts from a different place. It asks whether biological changes associated with ageing can be slowed before they contribute to multiple diseases.

One of the companies pursuing that idea is Loyal, a US biotechnology company developing drugs intended to extend dogs’ healthy lifespan. Its most advanced candidate, LOY-002, is being studied in older dogs and is designed to target metabolic changes that occur with age.

The company has passed two significant stages in the US Food and Drug Administration’s expanded conditional approval process. The FDA has accepted its submissions relating to safety and what is called a reasonable expectation of effectiveness. Work on the manufacturing component continues.

That progress matters, but it is not the same as approval. LOY-002 cannot currently be prescribed or purchased, and there is not yet published evidence showing that dogs taking it live longer. The trial that should tell us more is already fully enrolled, with 1,300 dogs taking either LOY-002 or a placebo.

Rapamycin is the other name appearing frequently in canine longevity research. The drug has prolonged life in laboratory animals, and the Dog Aging Project is now testing it in older, larger pet dogs. Its TRIAD trial will look at what happens to the dogs’ heart function, movement, cognition and survival over time. Rapamycin already has medical uses, but it has not been shown to extend the lives of healthy pet dogs and should not be given for that purpose outside a properly supervised trial.

This is serious research, not science fiction. It is also unfinished research. A regulatory milestone tells us that a candidate has moved through part of a demanding process. It does not tell us that the central promise has been fulfilled.

The clearest evidence begins with weight

If future drugs sound dramatic, one of the best-supported things we can do now is decidedly ordinary: help dogs maintain a healthy body condition.

A long-running study involving 48 Labrador retrievers paired dogs from the same litters and fed one member of each pair less than the other. The more lightly fed dogs remained leaner, developed several chronic conditions later and lived a median of almost two years longer.

This study is often reduced to an instruction to feed dogs 25 per cent less, but that is not a sensible rule to apply at home. Dogs have different bodies, activity levels, health conditions and nutritional needs. The important result was not that every bowl should contain an arbitrarily smaller amount. It was that avoiding excess weight appeared to have consequences far beyond appearance.

Researchers have also followed much larger populations of dogs. When they compared dogs of several common breeds, those recorded as overweight in middle age generally did not live as long as those kept at a healthy weight. The gap was not identical from one breed to another, which is exactly why the finding is more useful as a broad pattern than a prediction for any one dog.

The number on the scales cannot tell you whether your dog is in ideal condition by itself. Two dogs can weigh the same and carry very different amounts of fat and muscle. That is why vets feel along the ribs and look at the waist and the shape of the abdomen, as well as recording weight.

Weight is not purely a matter of willpower or measuring food correctly. Pain can reduce movement. Medication may affect appetite. Neutering can change energy requirements, and age-related muscle loss may alter a dog’s shape even when the number on the scales barely moves. A useful weight plan begins with the reason a dog is gaining or losing, not an assumption about the owner.

What routine care can really do

Preventive veterinary care is sometimes presented as though every check-up deposits a little more time into a dog’s future. It cannot offer that sort of certainty. What it can provide is a record of how that particular dog normally looks, weighs and behaves, making an emerging change easier to spot.

Gradual changes are particularly good at hiding in ordinary life. A dog may begin drinking a little more, take longer to loosen up after sleeping or lose weight slowly enough that nobody notices from one day to the next. An earlier diagnosis will not alter the course of every illness. In some cases, though, it gives the dog and their vet choices that might not remain available later.

Vaccines and parasite treatments are part of preventive care too, but there is no single schedule that suits every dog. Where they live, where they walk, their age, medical history and exposure to other animals all affect what protection they need. This is something to review with a vet rather than copy from another dog’s routine.

Dental care deserves attention for a simpler reason than some longevity claims suggest. Periodontal disease can be painful. It can lead to inflamed gums, infection, loose teeth and difficulty eating, while many dogs continue behaving relatively normally despite significant disease inside the mouth.

Dental disease has been associated with changes elsewhere in the body, but claims that an unclean mouth inevitably damages a dog’s vital organs go beyond what has been established. Its direct effect on lifespan is also uncertain. None of that makes oral care unimportant. Preventing chronic pain and preserving a dog’s ability to eat comfortably are worthwhile outcomes in their own right.

Exercise has a similarly broad role. We cannot convert a particular number of walks into a promised number of additional years, but appropriate movement helps maintain muscle, mobility, cardiovascular fitness and a healthy body condition. An older dog may no longer manage the routes they once did, yet they can still benefit from moving regularly. Shorter walks, gentler terrain and time spent sniffing can keep them active without asking their body to do more than it comfortably can.

Food attracts far more complicated claims than the evidence can support. What dogs need is a complete diet that meets their nutritional requirements and is appropriate for their health, age and level of activity. No particular fashionable ingredient, supplement or way of feeding has been proven to add substantial years to the life of the average pet dog. Dogs with medical conditions may need something more specific, but that is a clinical decision rather than a longevity trend.

The body a dog is born into

Owners can influence risk, but they do not begin with a blank page. Size, anatomy, inherited disease and genetic diversity all help shape a dog’s chances of reaching old age.

A large UK study published in 2024 examined data from more than half a million dogs. Smaller dogs generally lived longer than larger ones, while flat-faced dogs had a greater risk of earlier death than dogs with proportionate or longer muzzles. Breed differences remained even among dogs of a similar size.

Those findings describe populations rather than destinies. They cannot tell us exactly how long the French bulldog, Great Dane or terrier in front of us will live. They do show that breeding decisions have consequences which attentive ownership cannot always undo.

Shortened skulls do not only change how a dog looks. In flat-faced breeds they are linked to obstructed breathing, eye problems and other disorders which may affect a dog throughout life. Large dogs have their own pattern of risk. They tend to reach old age sooner and some serious conditions are more common among them. That information can help an owner and vet decide what to watch closely, but it also belongs in conversations about which dogs we choose to breed in the first place.

An individual dog is still more than the average recorded for their breed. They did not choose their size, their muzzle or the genes they inherited. Responsibility sits with breeders, buyers, governing bodies and a culture that continues to reward physical features even when dogs pay for them with their health.

Does happiness help a dog live longer?

The relationship between a dog’s social world and their lifespan is appealing, but easy to overstate.

Research from the Dog Aging Project has found associations between aspects of a dog’s environment and owner-reported health. In a study of more than 21,000 dogs, greater social support, including living with other animals, was associated with better reported health after factors such as age and weight were taken into account. Financial and household adversity were associated with poorer health and reduced mobility.

The study did not prove that companionship causes dogs to live longer. It relied substantially on information supplied by owners, and many parts of a dog’s life are connected. A household with more time, money or support may also be better placed to provide veterinary care, suitable exercise and consistent routines.

Even without a proven lifespan effect, a dog’s daily experience matters. Suitable companionship, rest, play, opportunities to explore and some control over ordinary choices contribute to welfare now. The value of giving a dog a good life does not depend on showing that it will produce an extra year at the end.

There is good reason to give dogs opportunities to sniff, learn and work things out, especially as they grow older and their physical world becomes smaller. These activities can hold their interest and give the day more texture. We should offer them for those reasons, rather than promising that a puzzle feeder or nosework session will make a dog live longer. No research has established that it will.

Longevity is not a reward for perfect care

When a dog becomes ill, it is very easy to start auditing the life they had before it. The missed evening of tooth brushing suddenly feels important. So does the period when they carried extra weight, the appointment booked later than intended or the food you might have chosen differently with the benefit of hindsight.

That is not proof that any of those things caused the illness. A dog can be kept lean, eat an appropriate diet, remain active and receive excellent veterinary care, then develop cancer or kidney disease anyway. Another may reach an extraordinary age without anything resembling a carefully planned health regime. Care affects risk, but it does not distribute illness according to who tried hardest.

For your own dog, begin with what you can actually observe. Learn how their ribs and waist feel when they are at a healthy weight. Notice if they start moving differently, drinking more, leaving food, sleeping at unusual times or behaving in a way that is new for them. Familiarity with the ordinary version of your dog makes change easier to recognise.

Science may eventually give us a safe treatment that slows canine ageing. Such a drug would change the possibilities of veterinary medicine, particularly if it preserved good health rather than merely postponing death.

For now, no intervention can promise more years. Good care gives a dog a better chance of remaining comfortable and well, while helping us recognise sooner when something has begun to change.

More time would be extraordinary. The work available today is to make the time already in front of them as healthy and comfortable as it can be.