Researchers also noted that individuals who owned dogs originally bred for hunting, such as terriers, retrievers and scent hounds, saw even greater benefits. It's unclear exactly why this is, but researchers suggest that these breeds require more exercise, meaning the owner is necessarily more active and healthier.
However, while the study clearly shows correlation between dog ownership and better heart health, it may not necessarily prove causation.
"These kind of epidemiological studies look for associations in large populations but do not provide answers on whether and how dogs could protect from cardiovascular disease," Tove Fall, a professor at Uppsala University and senior author of the study, told the BBC.
"There might also be differences between owners and non-owners already before buying a dog, which could have influenced our results, such as those people choosing to get a dog tending to be more active and of better health."
At the same time, previous research has also pointed to the positive health benefits of owning dogs. For example, one study showed that children with dogs at home had a 15 percent reduced risk of asthma. Authors of that study suggested this was due to the "hygiene hypothesis," which posits that too clean of an environment actually increases an individual's susceptibility to allergies.
In fact, the authors of the new study also said a possible reason for the positive effect of dogs on the heart may be connected to bacteria. According to the researchers, dogs actually change the dirt in their owners' environment, meaning they may also influence their owner's bacterial microbiome. This collection of microscopic species lives in the gut and may benefit cardiovascular health.
But perhaps the biggest factor the research points to is the social aspect of owning a dog.
"[Dog ownership] may encourage owners to improve their social life, and that in itself will reduce their stress level, which we know absolutely is a primary cause for cardiovascular disease and cardiac events," Dr. Rachel Bond, associate director of women's heart health at Lenox Hill Hospital in New York, told CNN.
And of course, dogs definitely increase an individual's overall happiness.
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"As many dog owners may agree, the main reason for owning a dog is the sheer joy," Dr. Mike Knapton of the British Heart Foundation told BBC.
"Dog ownership has many benefits, and we may now be able to count better heart health as one of them,” she said.