A team of researchers selected 4 million people in the United States, Canada, Scandinavian countries, New Zealand, Australia and the United Kingdom in 2019.
The study found that those who kept dogs had a lower mortality rate than 24%.
Having a pet dog like this is good for the health of someone who has a disease such as heart disease or stroke.
The study found that the risk of dying from a heart attack was reduced by 31%.
Some critics say the study did not take into account other medical conditions, such as social and economic factors.
