Key points from article :
Owning a dog may encourage people to be more active by taking their dog for a walk.
Canadian study showed whether people who owned dogs were more or less likely to live longer.
Dog owners were less likely to have died during follow-up than people who did not own dogs.
According to Swedish study dog owners were 21% less likely to have died after a heart attack.
Both studies were published in the peer-reviewed journal Circulation.
