Research: Pet dog microbiota may protect young children from respiratory tract infections and reduce the need for antibiotic courses
Children who have been in contact with dogs in early childhood are on average healthier and require fewer antibiotic courses than children without such contact. The protective association is explained, at least in part, by the spread of dog-associated microbes in the home.
In our recent study, the presence of specific dog-associated microbes in the home were linked to fewer respiratory tract infections, fewer antibiotic courses and more healthy weeks during the child’s first year of life. The richness and diversity are higher in homes with a dog than in homes without a dog, but these general characteristics of the microbiota were not associated with the incidence of respiratory tract infections or morbidity in the child.
Our study shows that certain dog-associated microbes or their combinations can explain up to one quarter of the protective effect of dog ownership on children’s respiratory tract infections, antibiotic use and the number of healthy weeks during the first year of life.
The protective effect of a dog ownership remained also after accounting for other factors known to influence childhood infection risk, including family size, living environment and exposure to tobacco smoke. In addition to the dog’s microbiota, a more outdoor-oriented lifestyle in dog-owning families, shared responsibilities related to caring for the dog and partly similar dietary habits shared among dog owners may influence the microbiota in the home and among its inhabitants, and thereby the development of the child’s resistance to pathogens. These factors were not examined in this study.
“The results strengthen our understanding that the microbial environment during early childhood plays an important role in the development of child’s immune system. It has been suggested that in the future it may be possible to modify the home microbiota in ways that promote health. Our study shows that dog ownership already does this today,” says paediatrician Jenni Mäki.
“Respiratory tract infections in early childhood are a significant risk factor for asthma. When some of children’s respiratory tract infections can be prevented with dog-associated microbes, this may also reduce the child’s risk of developing asthma later in life,” says chief researcher Anne Karvonen.
The LUKAS study included nearly 400 families from Finland. About one third of the families lived on farms, half in rural areas and the rest in towns.
The study was carried out by the Finnish Institute for Health and Welfare, Kuopio University Hospital and the University of Eastern Finland.
Source
Mäki JM, Kirjavainen PV, Täubel M, et al. The role of dog keeping in the home microbiota and its impact on children's health. Pediatr Allergy Immunol. 2026;37:e70408. doi:10.1111/pai.70408
Further information
Jenni Mäki
visiting researcher, paediatrician
THL, Kuopio University Hospital and the University of Eastern Finland
tel. 044 717 6828
[email protected]
Anne Karvonen
chief researcher
THL
tel. 029 524 6325
[email protected]