Getting a dog improves your health in ways that are surprisingly well-documented. Dog owners have a 24% lower risk of dying from any cause compared to non-owners, according to a meta-analysis of ten studies. That’s not a vague wellness claim. It’s a measurable shift in longevity driven by more movement, less stress, stronger social connections, and meaningful changes in your brain chemistry. Here’s what the evidence actually shows.
Your Heart Gets Measurably Stronger
The cardiovascular benefits of dog ownership are some of the most striking. People living in multi-person households with a dog have a 15% lower risk of dying from cardiovascular causes compared to similar households without one. For people living alone, the effect is even larger: a 36% reduction in cardiovascular death risk and an 11% lower risk of heart attack.
The most obvious explanation is exercise. Dog owners in a large UK community study walked a median of 250 minutes per week, compared to just 90 minutes for non-dog owners. That’s nearly three times as much walking. Among people who already walked recreationally, dog owners still logged 39% more minutes per week. Most health guidelines recommend 150 minutes of moderate activity weekly, so dog owners tend to exceed that target by a wide margin simply by keeping up with their daily walks.
Walking isn’t the whole story, though. The stress-reduction and social connection benefits of having a dog likely contribute to heart health independently of exercise.
Stress Hormones Drop When You’re With a Dog
Spending time with a dog lowers cortisol, the hormone your body produces under stress. In controlled studies with children, a single session interacting with a dog reduced cortisol levels significantly, with the effect holding steady across repeated sessions over several weeks. Children with special educational needs showed especially large reductions: their average cortisol levels dropped by roughly 42% over a four-week program of group sessions with dogs.
This isn’t unique to therapy settings. The underlying mechanism appears to be biological. When you and a dog make eye contact, both of you experience a rise in oxytocin, the same hormone that strengthens the bond between parents and infants. Research published in Science found that this mutual gaze creates a positive feedback loop: the dog gazes at you, your oxytocin rises, you become more affectionate, and the dog’s oxytocin rises in turn. Wolves raised by humans don’t trigger this response. It’s specific to dogs, likely shaped by thousands of years of coevolution.
Depression Symptoms Improve Significantly
The mental health case for getting a dog goes beyond “they make you feel good.” Clinical studies measuring depression with standardized scales consistently show meaningful improvements in people who interact with dogs. In one study of elderly patients, depression scores dropped by 50% over the course of a dog-assisted program. Another study found that adults who spent time with a therapy dog once a week for six weeks saw their depression scores fall from an average of 15.4 to 10.7, a shift from moderate depression into the mild range. Control groups in these studies showed no comparable improvement.
For people with severe dementia, the effects were even more pronounced. Participants in a dog interaction program saw depression scores decrease by an average of 4.5 points, while the control group’s scores actually worsened by nearly 5 points. The gap between the two groups was striking enough to suggest that the presence of a dog doesn’t just lift mood temporarily but may protect against the deepening of depressive symptoms over time.
Loneliness Becomes Less Likely
Older adults who own pets are 36% less likely to report feeling lonely, even after controlling for whether they live alone, their general mood, and other factors. That matters because loneliness in older adults is associated with cognitive decline, higher blood pressure, and increased mortality. A dog provides daily structure, a reason to go outside, and a living being that responds to your presence. For people who live alone, those small interactions add up.
Dogs also make it easier to connect with other people. Research on social interactions during walks found that simply being accompanied by a dog significantly increased the number of conversations a person had with strangers. The effect was stronger than dressing well or other social signals. Dogs serve as natural conversation starters, lowering the barrier to casual interaction in a way that benefits people of all ages, not just seniors.
Children Raised With Dogs May Have Fewer Allergies
This one surprises a lot of parents. Exposing children to a dog during their first year of life is associated with a 13% lower risk of developing asthma by school age. The protective effect also appears in preschool-aged children, with a 10% risk reduction. A large Swedish study using national health registries found these associations after accounting for family history and other risk factors.
The leading theory is that early exposure to the diverse microbes dogs carry into the home helps train a child’s developing immune system, reducing the likelihood of overreacting to common allergens later. This doesn’t mean you should get a dog solely for allergy prevention, but if you’re worried that having a dog around a baby is risky, the evidence points in the opposite direction.
The Costs Are Real but Predictable
The benefits are substantial, but so is the commitment. In 2025, annual food costs for a dog range from about $655 to $1,905 depending on the size of the dog and quality of food. Routine vet visits run $75 to $110 per visit, and pet insurance costs between $602 and $1,120 per year. These are just the baseline expenses. Emergency vet bills, boarding, grooming, and supplies add more.
Beyond money, dogs need one to two hours of your time daily for walks, play, and basic care. They need consistency, which means adjusting travel plans and daily routines around another living creature’s needs for 10 to 15 years. The health benefits documented in the research come precisely because dogs demand that daily investment. You walk more because the dog needs a walk. Your stress drops because you spend time with the dog. The routine is the mechanism, not a side effect.
If you have the financial stability, the living space, and the daily time to commit, the evidence strongly favors getting a dog. The benefits span nearly every dimension of physical and mental health, from your cardiovascular system to your cortisol levels to the number of conversations you have in a week. Few single lifestyle changes offer that range of returns.