Researchers at Cincinnati Children’s Hospital have uncovered new insights into how growing up with dogs may protect children from severe food allergies. This research, published on November 11, 2025, in the journal Allergy, enhances understanding of the molecular mechanisms involved in the ‘hygiene hypothesis.’
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The study involved 147 children with atopic dermatitis (AD), a condition that increases the likelihood of developing severe allergic diseases. The team, comprised of 19 experts in various fields including immunology and genetics, examined genetic activity in the children’s antibodies. They specifically looked for somatic hypermutation (SHM), a process that encourages the immune system’s B cells to produce stronger immune responses.
Among the participants, some children had allergies to food items like peanuts, milk, or eggs, while others did not. Those with food sensitivities were found to have high levels of IgE, an antibody that triggers severe allergic reactions. Interestingly, these children displayed lower levels of SHM in their IgE genes.
Krishan Roskin, PhD, the study's corresponding author, noted that rather than showing an overactive immune response, the findings suggested that food allergen sensitization in children under six resembles a suppressed immune system. Moreover, children living with dogs showed signs that this suppressed immune development was mitigated, suggesting that canine presence may encourage normal immune function in young children.
The study pointed out that this protective effect seems to be specific to dogs, rather than pets in general. It supports the hygiene hypothesis, which posits that exposure to less sterile environments may reduce allergy risks. Roskin emphasized that the findings illustrate how non-sterile environments can positively influence the developing immune system, particularly as new immune-stimulating drugs are being evaluated in clinical trials.
The research only addressed food allergies and did not connect B cell changes to airborne allergies such as pollen or mold. Roskin plans to present these findings at future scientific conferences, and further research is needed to explore these results beyond children with atopic dermatitis and into those with clinically confirmed food allergies.
Co-authors of the study include Kirandeep Gill, Carolina Moore, Onyekachi Nwogu, and others from Cincinnati Children’s, supported by various core facilities and funding from agencies including the National Institutes of Health and the National Science Foundation.