This was on imgur recently http://imgur.com/gallery/Octdtr3 dog reacting to owner having a PTSD attack.

On the other side of the spectrum I remember a friend taking her young lab back into her car because he wasn't behaving right, and that little puppy, right before closing the door, pulled the most saddest face (yet funny) I've ever seen: sad eyes, tilted head, sad sounds, everything in order for an Oscar.