Some dogs may be more persistent sniffers than others. Age, temperament, previous experiences, training, and the environment can influence how frequently this behavior occurs.
Although scent is central to canine communication, dogs also use body posture, facial expressions, vocalizations, and movement to understand social situations. Sniffing is only one part of a much broader system of communication.
Chapter 3: Can Dogs Detect Hormonal Changes?
One reason this behavior attracts attention is the possibility that dogs can detect changes in human body chemistry. Dogs have been trained to identify certain odors associated with medical conditions, and researchers continue to investigate how canine scent detection may support healthcare.
Human scent can change for many reasons, including hormonal fluctuations, stress, diet, medication, and illness. Dogs may notice some of these changes, but their responses are not always specific enough to identify a particular cause.