Although every person experiences health issues uniquely, numerous accounts demonstrate that dogs can detect and react to human sickness in remarkable ways. Credit: Boris Jovanovic | Getty Images
A physician initially diagnosed Heather May with the flu, yet the large yellow Labrador Retriever she had recently adopted, named Scout, appeared to perceive a far graver situation unfolding.
While recuperating at home, May recalls that Scout refused to leave her side. He positioned himself on the bed, resting his head directly on top of her body. Even more unusually, he declined his meals entirely. At the time, May was perplexed about what might be troubling her dog.
The attorney residing in the Dallas, Texas region eventually coaxed Scout outdoors to relieve himself in the backyard area.
Settling into her recliner due to mounting dizziness, May blacked out momentarily. Upon regaining awareness, Scout was frantically scratching at the door, barking insistently, and thudding against it with his body. She realized her position in the chair had shifted dramatically from when she first sat down.
Once Scout re-entered the house, he immediately leaped into the recliner alongside her. Moments later, May experienced another lapse in consciousness. This sequence of events led her to recognize that she was suffering from seizures.
Attempting to summon her husband from upstairs, May struggled to project her voice with sufficient volume. Overcome by dizziness once more, she grasped a stool from the nearby breakfast bar for support. The subsequent moment found her collapsed on the floor, convulsing violently, having struck her head in the fall. Throughout this ordeal, Scout maneuvered himself beneath her as best he could, barking with intense urgency.
Alerted by the dog’s vigorous commotion, May’s husband hurried downstairs, discovered her condition, dialed emergency services, and paramedics swiftly transported her to the medical facility.
Medical evaluation revealed that erratic electrical impulses in May’s heart were causing a complete heart block, a severely dangerous health crisis.
What enabled Scout to detect that something was amiss? Do dogs possess the ability to recognize when their humans are unwell? Are they capable of discerning such states? Can they perceive illness intuitively?
Can Dogs Detect Illness Through Scent?
Dogs are exceptionally adept at sensing human sickness primarily through their extraordinary olfactory capabilities, which allow them to identify a wide array of diseases and medical states by detecting subtle scent variations.
Dr. Stanley Coren’s dog, Wiz, would deliver his most cherished toys to his owner during times of illness. Credit: SC Psychological Enterprises Ltd.
During periods of illness, significant shifts occur in our internal body chemistry, and canines have demonstrated a profound sensitivity to these alterations, according to Dr. Stanley Coren, Professor Emeritus in the Psychology Department at the University of British Columbia. He is a distinguished scholar and author specializing in canine intelligence.
Scientific investigations are only beginning to uncover the full spectrum of health conditions that dogs’ superior sense of smell can identify. Conditions such as various cancers, COVID-19 infections, and certain neurological impairments represent just a fraction of the illnesses that studies have validated dogs can detect through odor cues.
Additional Methods Dogs Use to Perceive Human Sickness
Beyond olfactory detection of chemical changes, dogs often respond to the physical discomfort, pain, or elevated stress levels that accompany illness in humans. These emotional and physiological shifts are readily discernible to our canine companions.
Research indicates that dogs can accurately identify elevations in cortisol, the stress hormone that surges during moments of anxiety or nervousness in people.
Dr. Coren has observed this capability directly through his experiences. He has trained several of his own dogs over the years to serve as therapy animals. Together with colleagues, he has brought these dogs to mental health group therapy sessions, consistently noting the same pattern of behavior.
In these settings, the dogs instinctively gravitate toward the individuals exhibiting the greatest need for comfort, offering their attention specifically to those participants. Dr. Coren explains that canines excel at interpreting these emotional signals, distinguishing stress and fear with precision.
Apart from tangible physical indicators, countless dog owners attest that their pets possess an innate understanding of when emotional support is required during illness. The mechanisms behind this perceptiveness remain a subject of fascination.
Dr. Coren posits that while specific disease-detection skills can be honed through targeted training for practical applications, the broader behavioral reactions dogs exhibit toward human illness stem fundamentally from the emotional disruptions illness induces.
Do Dogs Truly Recognize When Humans Are Unwell?
Dogs do not rely solely on their unparalleled sense of smell; they also possess sharp observational skills honed over millennia of close association with humans. This evolutionary partnership has equipped them to adeptly interpret our emotional conditions and daily patterns.
Through selective breeding, humans have enhanced dogs’ attunement to our verbal commands, facial expressions, and emotional states, making them exceptionally vigilant observers of our typical behaviors. Dr. Coren notes that any deviation from established norms prompts a response from dogs, forming the foundation for many of the caring actions they display.
In essence, dogs vigilantly track our routines and mirror our states accordingly. They grow highly familiar with schedules, as evidenced by the disruption caused by events like Daylight Saving Time shifts that alter mealtimes and spark temporary canine distress.
Dr. Coren elaborates that the primary catalyst for a dog’s concerned response during human illness is the disruption of established routines. Activities such as regular walks may be shortened or skipped, movements become sluggish, or bed rest predominates, all of which unsettle dogs who thrive on consistency and predictability.
Dogs derive comfort from reliable patterns in behavior, and sudden changes can provoke anxiety or compensatory actions in them.
This dynamic played out in Dr. Coren’s own life with his dog Wiz, a quintessential Cavalier King Charles Spaniel known for his gentle, sociable nature. Wiz rarely displayed possessive tendencies except concerning his beloved toys.
However, during an episode when Dr. Coren was confined to bed due to illness, Wiz deviated from his norm in a touching manner. Awakening after an extended nap, Dr. Coren discovered three of Wiz’s prized toys carefully placed on his chest-a clear gesture of solidarity and comfort offered by the dog in response to his owner’s vulnerability.
Scientific rationales abound for these intuitive canine behaviors, yet when dogs actively seek to soothe, reassure, or warn us during illness, it evokes a profound sense of interspecies empathy that transcends explanation, resembling something miraculous in its depth.
Profound Bonds Between Canines and Humans
In Heather May’s harrowing experience, timely hospital intervention allowed for the implantation of a pacemaker, which now effectively stabilizes her cardiac rhythm.
Nevertheless, she continues to marvel at Scout’s prescient awareness of her critical condition. Did he perceive fluctuations in her heart rate-a sensory feat dogs are known to accomplish? Was it the abrupt alteration in their daily rhythm? Or perhaps an undiscovered canine instinct at play?
The precise trigger may forever remain elusive, but May has resolved to heed any future signals from Scout or her other dogs indicating potential trouble.
She advises fellow dog owners to pay close attention if their pets exhibit unusual persistence in seeking interaction or deviate from standard conduct. Should Scout display similar urgency again, May intends to insist on comprehensive medical evaluations, trusting her dog’s instincts as a vital indicator of health concerns.
