Scientific studies explore physiological links between humans and pets

New research highlights the complex physiological and behavioral connections between humans and their domestic animals.

An anthropologist from the University of Toronto conducted a study involving 38 pairs of humans and dogs (specifically Huskies and Malamutes). The findings suggest a bidirectional relationship regarding sleep patterns: when a human moves during the night, there is a high probability the dog will also move within minutes. In 45 percent of the cases where activity patterns were linked, the human's movement preceded the dog's.

In a separate study published in iScience, researchers from Kyoto University investigated the hormonal connection between cat owners and their pets. By measuring oxytocin and cortisol levels, the team found that owners with higher oxytocin levels tended to have cats with similarly high levels. This hormonal alignment was also associated with lower cortisol levels—a marker of stress—in the owners. Lead author Saho Takagi suggested that physical interaction, such as petting, may help raise oxytocin levels in both species, strengthening their bond.