The American Heart Association has declared that owning a pet might be a factor in preventing heart attacks. Of course, a randomized, placebo-controlled, clinical trial would be required for definitive proof. I am not sure how that could possibly be done. But I am sure that a dog who shows gratitude and affection would be good for you.
See Family Practice News, June 15, 2013, p. 9.
Celebration of Health Association website