I remember seeing a poem after the 9/11 attacks about what happened at the Rainbow Bridge that day. The keeper of the Bridge called all the puppies and kitties who didn't have a person to wait for together and told them that there had been a great tragedy in the human world and there were a great many people who also didn't have anyone waiting for them coming. Of course, the little kittens and puppies who had never known human love and companionship ran to the end of the Bridge to give their love to all the people coming in who were confused and scared. The little ones understood being scared and confused and loved these people just because.
Gosh, it only took me 4 tries to finish this post without bawling here at work. I would look for the poem, but I can't do it right now.