This isn’t just a feel-good story. The science is real.
According to the NIH, interacting with animals has been shown to decrease cortisol — that’s the hormone your body pumps out when you’re stressed — and lower blood pressure. Not just over time. It happens during the interaction.
Cortisol is the stuff that makes your heart race before a test, keeps you up at night, and leaves you feeling wrecked after a hard day. Having too much of it too often wears your body down. So the fact that hanging out with a dog or cat can actually bring those levels down? That’s a big deal.
And the effect goes beyond just stress. Research suggests that positive interactions with pets may trigger the release of oxytocin and endorphins — the same feel-good chemicals your brain releases when you hug someone you love or laugh really hard. Your body basically treats pet interaction as a form of connection. Because it is. Keep in mind that research in this area is still developing, and effects can vary from person to person.
Loneliness is one of the biggest mental health issues for people your age right now. Pets help with that too. Studies have found that animals can reduce feelings of loneliness and increase your sense of social support — even if the animal can’t talk back. There’s something about being needed, being greeted, being chosen by a creature that genuinely seems to fill a gap.
Older adults who own pets report less stress, less loneliness, and better overall quality of life. And those with strong bonds to their pets tend to have lower rates of depression. While much of this research has focused on older age groups, the underlying biology of stress relief appears across the lifespan.
You don’t have to own a pet to get some of this. Even brief contact with animals seems to produce these effects. That’s why therapy dogs show up in hospitals, college campuses during finals week, and disaster relief zones. It’s not just cute — it’s functional.
So if you’re ever at a friend’s house and their dog won’t leave you alone, just let it happen. Your cortisol will thank you.