An Unusual Health Advantage of Owning a Dog

Key Takeaways
Dog bacteria may help reduce allergies.
Pets introduce diverse bacteria to indoor environment.
Daily dog-walkers tend to be healthier.
Exposure to animal bacteria may affect mood.
Pharmaceutical companies may create dog-germ supplements.
Pet bacteria may benefit immune system and brain function.
Pets may help lower risk of allergies and obesity.
Frequently Asked Questions
References

The Beneficial Bacteria from Canine Companions

Dogs are not only cherished companions but also play a crucial role in supporting our immune system. According to a researcher, pharmaceutical companies might soon promote the consumption of a pill containing dog-derived bacteria. While the idea may initially sound unappealing, some medical experts foresee a future where such pills could offer health benefits based on the positive effects of canine bacteria on humans.

Overview

A research study conducted at the University of Alberta reveals that individuals living with pets, mostly dogs, have higher levels of probiotic bacteria in their gut. These bacteria are associated with reduced allergy occurrences and a decreased risk of obesity.¹ The study indicates that these beneficial bacteria are sourced from their pets. Specifically focusing on children, the study demonstrates that growing up in a pet-friendly household can lower the risk of allergies and weight issues in adulthood. Researchers suggest that exposure to the bacteria carried by dogs helps maintain a healthier immune system. Ruminococcus and oscillospira are two bacteria found in dogs that were identified as beneficial in the study. Dr. Anita Kozyrskyj, the lead researcher, mentions that the presence of a pet in the house doubles the abundance of these two bacteria. Infants indirectly acquire these bacteria from dogs, as the microbes are transferred from the dog to the pregnant mother and then to the fetus. Even if the dog is given away before the baby is born, children receive a beneficial dose of probiotic bacteria while in the womb. Dr. Kozyrskyj anticipates that due to the remarkable benefits of these bacteria, pharmaceutical companies may develop a supplement containing these microbiomes, similar to probiotics.

The Microbial Diversity Within

Research indicates that our homes host a vast array of microorganisms, creating an indoor zoo of microscopic creatures. Dust in households contains over 60,000 types of fungi and more than 110,000 species of bacteria.² While our bodies release millions of bacteria into the indoor environment every hour, having a dog or another pet introduces additional bacteria that offer unique health benefits. Dogs contribute over 50 bacterial species, while cats add approximately two dozen.³ In addition to aiding the immune system and reducing susceptibility to autoimmune conditions like asthma and allergies, this increased microbial diversity may positively impact mood and brain function. The nerve system linked to the digestive tract releases neurotransmitters that play a crucial role in managing depression, stress, and memory. The introduction of various bacteria from pets into the body has the potential to support this system, although researchers are still unraveling the mechanisms involved.⁴ Jack Gilbert, the director of the Microbiome Center at the University of Chicago, suggests that exposure to animal bacteria could influence the metabolism of gut bacteria, impacting mood and other cognitive functions.⁵ It is also worth noting that dog owners who walk their pets daily tend to be more physically active and enjoy better health compared to non-dog walkers.⁶

References

Fadó R, Molins A, Rojas R, Casals N. Feeding the Brain: Effect of Nutrients on Cognition, Synaptic Function, and AMPA Receptors. Nutrients. 2022 Oct 5;14(19):4137. doi: 10.3390/nu14194137. PMID: 36235789; PMCID: PMC9572450.

Zhang R, Zhang M, Wang P. The intricate interplay between dietary habits and cognitive function: insights from the gut-brain axis. Front Nutr. 2025 Jan 29;12:1539355. doi: 10.3389/fnut.2025.1539355. PMID: 39944956; PMCID: PMC11813792.

"Food for the Brain" initiative by the Food for the Brain Foundation, a UK-based charity dedicated to raising awareness about the impact of nutrition and lifestyle on mental well-being and cognitive health.

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Susan Parker

Susan Parker is a 49-year-old Senior Manager at a marketing firm. With two older children becoming more independent, she is now focusing on her own health and wellbeing. She’s passionate about natural and holistic health approaches, and values high-quality, trustworthy products. Susan enjoys yoga, gardening, reading, and cooking, and seeks to stay energetic and sharp while balancing a busy career and personal life.