Previous scientific work has already shown that living with a dog has a positive effect on the human gut microbiota. Takefumi Kikusui from Azabu University (Japan) and his colleagues have repeatedly studied how interaction with pets influences human health. In their new research, the team wanted to find out whether the presence of a four-legged companion benefits teenagers’ wellbeing.
The scientists invited more than 300 thirteen-year-old participants to join the study. The mental health of the teenagers was assessed using a questionnaire.
Preliminary results showed that teenagers who take care of a dog generally feel better than other participants. This group also demonstrated the lowest level of aggressive tendencies and delinquent behavior.
Next, the researchers collected saliva samples from all teenagers. The composition of the oral microbiome was almost identical across the group. However, teenagers living with dogs had higher concentrations of Streptococcus and Prevotella bacteria. The latter showed a negative correlation with antisocial behavior.
To make sure that the pattern was not a coincidence, the team carried out an experiment with laboratory mice. The mice that received transplanted microbiome from the “dog-owning teenagers” became more attentive to their peers, sniffed them more often, and behaved more proactively.
The scientists note certain limitations of the study — for example, that mouse behavior should not be compared directly with human behavior. Nevertheless, they believe their results provide yet another argument in favor of owning a pet.