The calm of a dog’s laughter

Apparently researchers have found that there is a type of panting that a dog does that has a calming effect on other dogs. This is attributed to what we believe is a dog’s laugh.
How they believe that it’s a laugh is beyond me though. For all we know, that pant is a Scarface routine and everyone is shutting up before they get shut up. So far, they have had success in calming all K-9s in the shelter that they ran the test at 100% of the time with this version of a “dog’s laugh”.
Via ABCNews