Dogs Can Smell Human Stress, and It May Affect Their Mood

Dogs can detect stress chemicals in human sweat and breath, and research suggests the smell can make dogs more cautious and stressed too.

Medicine

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Dogs rely heavily on smell to understand the world, and research shows that their noses can detect chemical changes linked to human stress. In controlled experiments, dogs were given breath and sweat samples collected from people during relaxed and stressful situations. The stress samples contained odor changes that dogs could distinguish from normal samples. Later research looked at what happened when dogs were exposed to human stress odor without seeing or hearing the person involved. Eighteen dogs were tested using a food-bowl task designed to measure how they responded to uncertain rewards. When exposed to stress odor, the dogs were less likely to approach one ambiguous bowl, a pattern researchers interpreted as a more cautious or pessimistic response. The finding does not mean that dogs understand human stress in the same way people do, and it does not prove that every stressed person will make every dog anxious. It does suggest that chemical signals released during human stress can be detected by dogs and may influence their emotional state or behavior. The research adds another possible pathway through which human and dog emotions can affect one another, even without obvious visual or vocal cues.

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