Dogs may have more in common with humans than their loyalty and companionship. According to a new study from the Dog Aging Project, the same biological signals linked to lifespan in people also appear to be present in dogs, offering new insights into how aging works across species.
The research, published in The Journals of Gerontology, found that certain metabolites – small molecules produced during normal biological processes – can help predict lifespan in dogs in ways that closely resemble findings from human studies.
Researchers analyzed blood samples collected from dogs participating in the Dog Aging Project, a long-term study that tracks the health and lifestyles of pet dogs across the United States. By examining thousands of metabolites, scientists identified patterns associated with dogs that lived longer and those that died sooner.
Dr. Kate Creevy, Chief Veterinary Officer for the Dog Aging Project and professor at Texas A&M University, said the similarities between dogs and humans were striking.
“The molecules that are risky for dogs or protective against an earlier death are very similar to those in people,” Creevy explained. “This suggests that dogs and humans share important aspects of aging biology.”
Rather than focusing on a single molecule, researchers examined groups of metabolites that form what some scientists call a biological “fingerprint.” These patterns, known as biomarkers, can provide clues about an individual’s overall health and aging process.
The team then compared their findings with results from five large human studies that used similar methods. In each case, the metabolic patterns linked to earlier or later mortality showed remarkable similarities.
The findings reinforce the growing belief that pet dogs can serve as valuable models for studying aging. Unlike laboratory animals, dogs share many aspects of daily life with humans, including diet, environment, exercise habits, and social interactions.
Because dogs typically live only 12 to 13 years, compared to the average human lifespan of more than 70 years, researchers can observe the aging process and long-term health outcomes much more quickly.
Scientists believe these similarities could help accelerate discoveries that benefit both species. Insights gained from human aging research may help improve the health and longevity of dogs, while studies involving dogs could provide new understanding of aging in people.
The researchers emphasize that the identified biomarkers do not necessarily cause aging or death. Instead, they act as indicators that may point scientists toward the underlying biological processes responsible for health decline over time.
The study also highlights the importance of maintaining healthy lifestyles for dogs. According to Creevy, many of the same habits recommended for healthy human aging likely apply to pets as well.
Keeping dogs at a healthy weight, providing proper nutrition, encouraging physical activity, and supporting cognitive health may all contribute to healthier aging.
The research was made possible through the participation of thousands of dog owners who contribute information and biological samples to the Dog Aging Project. Their involvement continues to help scientists better understand the complex biology of aging.
While many questions remain, the study represents an important step toward uncovering why some individuals age more successfully than others. For researchers, it opens new avenues for exploring the biology of longevity. For dog lovers, it offers another reminder that the bond between humans and their canine companions may run deeper than ever imagined.