The bond between humans and their pets has long been celebrated, and mounting scientific evidence confirms that companion animals, especially dogs and cats, offer meaningful support for both mental and physical health.
Research shows that pets buffer stress and loneliness and can help lower cardiovascular risks, making them valuable allies for long-term wellbeing.
Research from the American Heart Association and other peer-reviewed studies link pet ownership with improvements in physical fitness, stress reduction, heart health, mood regulation and social connection. While these benefits are most pronounced in dog and cat owners, smaller pets also contribute through calming routines and steady companionship.
THE NEUROCHEMISTRY OF COMPANIONSHIP
Interacting with a pet triggers an immediate, positive physiological shift. “When humans pet an animal, we see a measurable spike in oxytocin, the ‘love hormone’, and a simultaneous drop in cortisol, our primary stress hormone,” explains Dr Kaili Chen, a clinical psychologist at Central Minds in Hong Kong.
Research from the National Library of Medicine in the United States shows these interactions help stabilise the hypothalamic-pituitary-adrenal axis and boost heart rate variability, a key marker of a resilient, relaxed nervous system.
Tracy Cheung, a clinical counsellor from Koa Counselling and Wellbeing in Hong Kong, echoes these findings: “Interacting with companion animals triggers the physiological changes that support mental health, directly lowering stress levels.” Over the long term, this regular interaction also helps lower blood pressure responses to external stressors
HEART HEALTH AND LONGEVITY
The cardiovascular benefits of pet ownership are striking. One 2019 study, “Dog Ownership and Survival: A Systematic Review and Meta-Analysis” in the journal Circulation: Cardiovascular Quality and Outcomes, involving more than 3.8 million participants, found that dog owners have about a 24 percent lower risk of all-cause mortality over roughly 10 years. The same data showed a 31 percent lower risk of cardiovascular death in dog owners overall, and an up to 65 percent reduction in mortality for those with prior coronary history who lived with a dog.
Dog owners are also far more likely to meet American Heart Association physical activity guidelines of at least 150 minutes of movement per week, thanks to daily walks and play. While dogs often get credit for encouraging an active lifestyle, cats provide their own cardiovascular advantages. Studies suggest that cat ownership can provide a calming presence to elevate stress, which is healthy for the heart.
ANCHORS IN THE STORM
Beyond numbers, pets act as psychological anchors. Their daily needs — walks, feeding, grooming — create a steady rhythm to help counter feelings of emptiness or loneliness, imposing a gentle structure on the day. For people navigating trauma or chronic mental health challenges, this grounding effect can be transformative.
“Pets act as secure attachment figures,” Dr Chen says, particularly for those with PTSD. “Because animals do not judge or require a survivor to explain their feelings, they reduce self-judgment and help ground the individual during a flashback or panic attack.”
Studies on veterans and disaster survivors have found that service dogs provide a safe emotional bond that can make it easier to rebuild trust in human relationships. The act of caregiving itself reinforces self-efficacy: looking after a pet gives tangible proof of competence and resilience, helping to counter helplessness over time.
Pets also function as social catalysts. Dog owners often find that casual conversations spark naturally during walks or at parks, easing social isolation. This is especially valuable for the elderly who might live alone.
THE POWER AND LIMITS OF PET THERAPY
Experts stress, however, that pets are not a universal remedy. For individuals experiencing severe depression or high financial strain, the responsibility of pet ownership can feel overwhelming and may worsen guilt or stress. In such cases, fostering, pet-sitting or volunteering at shelters can offer many of the emotional and biological benefits without the full-time commitment.
When the match is right, though, the relationship becomes a two-way street of wellbeing. Responsible care, enrichment and regular veterinary support ensure that both human and animal thrive, deepening a bond that lightens stress and strengthens health on both sides.