When you think about what you share with your dog or cat, companionship probably tops the list. But emerging research suggested that pet owners may have been sharing something far less visible too: parts of their gut microbiomes.
World Microbiome Day, observed on 27 June, shone a spotlight on the trillions of bacteria, fungi and other microorganisms that live in the digestive system and influence everything from digestion and immunity to brain function. Researchers said the microbiome had become one of the most exciting frontiers in both human and veterinary medicine, with growing evidence showing that the health of people and their pets may be more closely connected than previously thought.
Your Gut Microbiome May Mirror Your Pet’s
Scientists have been investigating how people and their pets influence each other’s microbiomes, with early findings suggesting that families often share similar microbial communities through their shared environment.
“There is actual research into people who have pets at home and how their gut microbiomes sync with their pets,” said registered dietitian and author Catherine Day. “We still have so much to learn about the microbiome, but what we’re discovering is incredibly exciting. If you are a healthy human, your pet is more likely to be healthy, and if your pet is healthy, that often reflects a healthy shared environment. It’s an incredible relationship.”
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Although researchers were still uncovering exactly how this connection worked, they agreed that the microbiome played a much bigger role than simply supporting digestion. It has been linked to immune function, metabolism and the gut-brain axis, making it a major focus of health research.
Everyday Habits Shape Your Microbiome
Scientists also found that the microbiome responded quickly to lifestyle choices. Diet, exercise, sleep quality and stress levels all influenced the balance of microbes living in the body. Eating a wide variety of fibre-rich foods appeared to help nourish beneficial bacteria that support overall health.
“There isn’t one miracle food or one miracle supplement that fixes everything,” said Day. “Looking after the microbiome is about taking a holistic approach. It’s about eating a diverse range of fibre-rich foods, moving your body, managing stress and sleeping well.”
Pet Nutrition Has Entered a New Era
While much of the attention around the microbiome has centred on human health, veterinary researchers have also been uncovering how these microscopic communities influence the wellbeing of companion animals.
Dr Karien Brink, veterinarian at Hill’s Pet Nutrition, said advances in microbiome science had fundamentally changed the way researchers approached lifelong pet health. “Everything we do is centred on lengthening and strengthening the lives of pets while strengthening the bond between pets and the people who love them,” Brink said.
Hill’s Pet Nutrition partnered with the One Health Microbiome Resource, an initiative developed alongside researchers at the Harvard T.H. Chan School of Public Health. The collaboration has been building one of the world’s most comprehensive microbiome reference resources for both humans and companion animals. By analysing thousands of microbiome samples, researchers hope to better understand how nutrition, disease and the environment shape health across species.
Why Your Pet’s Gut Health Matters Too
Brink said one of the most fascinating discoveries had been the growing evidence that families and their pets shared aspects of their microbiomes. “What fascinates me most is that families and their pets actually share aspects of their microbiome,” she said. “We need to look after our own microbiome, but we also need to look after our pets’ microbiomes because it’s influencing the whole household.”
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She added that researchers no longer viewed nutrition as simply a way to provide energy. “We now understand that the microbiome influences far more than digestive health,” Brink said. “It plays an important role in immune health and we’re learning more about the gut-brain connection in pets too. Nutrition is one of the most powerful tools we have to support lifelong wellbeing.”
The Tiny Organisms Making a Big Difference
For both experts, World Microbiome Day served as a reminder that some of the biggest breakthroughs in health could begin with the smallest organisms. “The microbiome is one of the most exciting areas of health research today,” Day said. “Every year we’re learning more about how these tiny organisms shape our health, often in ways we never imagined.”
As microbiome research continues to evolve, scientists believe caring for the invisible ecosystem inside the body could become one of the most effective ways to support long-term health for both people and their pets.
