People who train people to train dogs to help people are studying how dogs help people.  If anyone has any more science of the methodology, please comment.

Smithsonian mag has a story on dogs and helping veterans with PTSD:

http://www.smithsonianmag.com/science-nature/How-Dogs-Can-Help-Veterans-Overcome-PTSD-160281185.html

I like this warrior-canine connection:

Awesome.  And yet odd:  I swear I've heard about ptsd dogs for years, I have one, and yet all the posts in this thread include the one fair beast, Lundy.