Dogs may have more in common with humans than just sharing our homes and routines.
A new study has found that the same biological signals linked to lifespan in people also appear in dogs, suggesting that both species may age in remarkably similar ways.
The research comes from the Dog Aging Project, a long-term study that follows pet dogs throughout their lives.
Scientists discovered that certain molecules in dogs’ blood were associated with whether they lived longer or died sooner. Interestingly, these patterns closely matched those previously found in human studies.
The molecules involved are called metabolites.
They are tiny chemicals produced by normal processes inside the body and can provide clues about what is happening at the cellular level.
By studying these molecules, researchers hope to better understand why aging happens and what factors influence health and lifespan.
The researchers analyzed blood samples from dogs enrolled in the Dog Aging Project.
Owners participating in the study regularly provide information about their dogs’ health, lifestyle, and behavior, and some also submit biological samples each year.
The scientists then examined thousands of metabolites in the blood and looked for patterns linked to lifespan.
Instead of focusing on a single molecule, the researchers looked at groups of metabolites. They describe these patterns as a kind of biological “fingerprint.” Some fingerprints were associated with longer lives, while others were linked to earlier death.
These patterns are known as biomarkers. Biomarkers do not necessarily cause disease or death, but they can signal that important processes are taking place in the body.
By understanding why certain biomarkers appear, scientists may eventually discover ways to improve health and slow age-related decline.
One of the most striking findings was how closely the results in dogs matched those seen in people. The researchers compared their findings with five large human studies that also used metabolite data to predict lifespan. In every case, the patterns were very similar.
This overlap is exciting because it means discoveries in human aging research could help improve the health of dogs, and studies of dogs could also provide insights into human aging.
Dogs are particularly valuable for aging research because they live alongside people and often share similar environments, diets, and activity levels.
A dog’s lifestyle frequently reflects that of its owner. In addition, dogs have much shorter lifespans than humans. While people often live into their 70s or beyond, most dogs live around 12 to 13 years. This shorter lifespan allows scientists to study aging and its outcomes much more quickly.
The researchers say the findings are only the beginning. They have identified important clues about aging and now have new directions to explore.
For dog owners, the message is simple. The same habits that support healthy aging in people likely benefit dogs as well.
Providing a balanced diet, maintaining a healthy body weight, and helping dogs stay physically and mentally active may all contribute to a healthier, longer life—for both dogs and their humans.
