The Science of Why Petting Your Dog Lowers Stress
In 2002, researchers at the State University of New York at Buffalo ran a study on stockbrokers with high blood pressure. They split them into two groups. Both started blood pressure medication. One group also got a dog or cat. Six months later, when both groups were put under stress tests, the pet owners showed half the blood pressure spike of the non-owners. Their bodies were simply calmer under pressure.
That study, led by Dr. Karen Allen, is one of the most cited pieces of research on pets and stress. The evidence that petting a dog lowers cortisol, slows heart rate, and reduces anxiety has now been replicated across dozens of studies in multiple countries.
What Happens in Your Body
When you pet a dog, your brain releases oxytocin — the same bonding hormone released during human hugs and between mothers and newborns. At the same time, cortisol levels drop. This happens in both you and the dog. Research published in Science in 2015 found that when humans and dogs made sustained eye contact, both species showed elevated oxytocin. The bond is biochemically mutual.
Petting also activates the vagus nerve, which runs from your brainstem down through your chest and abdomen. Vagal activation slows heart rate, lowers blood pressure, and shifts the nervous system away from the fight-or-flight stress response. The effect starts within minutes and can last for hours afterward.
You Do Not Need a Therapy Dog
University studies consistently show the stress reduction effect with ordinary family dogs. No special training required. Just sitting with your dog, letting it rest near you, or a few deliberate minutes of petting is enough to trigger the response. The effect is strongest with physical contact — a dog across the room does not deliver the same result as one in your lap.
Sources
- Allen et al., 2002 — Psychosomatic Medicine — randomized trial showing pet ownership halves cardiovascular stress response in hypertensive adults
- Nagasawa et al., 2015 — Science — dog-human eye contact triggers mutual oxytocin release in both species
- Beetz et al., 2012 — Frontiers in Psychology — comprehensive review of animal-assisted interaction and cortisol reduction
- American Psychological Association — The Truth About Cats and Dogs — overview of pet ownership benefits on stress and mental health
For Dog Owners
Browse dog toys, harnesses, and care accessories in our Dogs collection.
For dog puzzle toys and enrichment, search dog puzzle toys on Amazon.
Find unique animal art, shirts, and mugs in our Etsy shop.
From Paw to Tail is a participant in the Amazon Services LLC Associates Program. Links marked with the Amazon tag earn a small commission at no extra cost to you.