Study Links Canine Temperament to Salivary Cortisol and Serotonin Activity

A recent study has identified connections between canine behavior traits and biological markers, specifically salivary cortisol levels and serotonin activity. Researchers from Kyungpook National University in the Republic of Korea conducted the study, which was published on February 4, 2026, in the journal *PLOS One*. The findings suggest that variations in these biochemical factors may correlate with differences in dog temperament.

The research team, led by Minjung Yoon, analyzed data to explore how cortisol—a hormone linked to stress—and serotonin—a neurotransmitter associated with mood regulation—relate to behavioral patterns in dogs. By examining salivary samples and observing behavioral tendencies, they uncovered notable associations between these physiological markers and specific temperament traits. The study provides new insights into the biological mechanisms that may influence canine behavior.

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Date: February 4, 2026

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GOAI