What is it about a dog?

What is it about a dog that can make even the worst days seem tolerable?  In my experience, any situation is better when there is a dog involved; even if the dog is not your own.  They greet you with a wagging tail and a warmth that is inexplicable.  It seems that they have never met a stranger.  They seem to have a way of making you realize that even at your lowest point, everything is going to be okay.  And it doesn't seem to matter how difficult their lives have been, they just want to bring joy to everyone around them.  They have so much love to share and seem to want to give all of themselves to making someone else happy.  I think we as human  beings could learn a lot from these kind and loving creatures!  The world would be a better place if we could learn to greet each other with a smile-even if we are complete strangers-and be more compassionate to our fellow humans.