You’ve had a horrible day. Your car was hit in the parking lot, you missed a project deadline, and you’re starving. You juggle your briefcase and keys, open the front door, and are greeted by a lop-sided grin and wagging tail. Laughing, you reach down and playfully tussle your Labrador’s head—all the worries melting away as you romp on the living room carpet. Ah, the joys of pets.

There is no doubt that the companionship and love a pet can offer is a valuable thing. But, maybe the benefits of pets go beyond this emotional bond. A growing body of evidence suggests that those who keep pets are likely to benefit from a variety of improvements in health.