Advance warning have a tissue handy. This is so heartwrenching in the beginning but so heartwarming at the end.
http://www.godvine.com/Meet-the-Scared-Dog-That-Only-Wanted-a-Hug-1087.html
http://www.godvine.com/Meet-the-Scared-Dog-That-Only-Wanted-a-Hug-1087.html