Is there any evidence that playing with or caring for a dog can help relieve general, daily life stress?

Stress relief: Yes, it helps to take ones mind off his immediate problems.This is especially true in children who have chronic illnesses.

Yes!: You can google "stress reduction and pet dogs studies, " and look for the schoarly articles. You'll find a lot of information. I would imagine, though, that some care needs to go into finding the right dog and creating a healthy relationship.