I remember reading after 9-11 about the emergency centers that were set up in New York to assist people who were missing family members. Volunteers took therapy dogs to the centers to just hang out. It was understood that even in the midst of such unspeakable tragedy and sadness, the presence of a dog added a sense of normalcy and warmth.
Volunteers take dogs to the nursing homes here. It is a joy to see the happiness of the folks when they cuddle and pet them. I imagine it brings back some touching memories of earlier years they had with their own pets.