If you live in the U.S. there’s a 47% chance that you have a dog. That number goes up to 56% if you live in Canada. When your dog goes on a walk with you, snuggles up next to you on the couch or tilts her head at something you say the bond between you deepens. Here comes the heartbreaking aspect of having a dog. They just don’t live long enough. Dr. Kirsten Peters, the “Rock Doc” offers some insight into why.