For many years psychologists and behavioral biologists agreed that laughter was a unique emotional expression found only in humans. However, as the study of animal emotions expanded this idea was called into question.

The Nobel Prize winning ethnologist, Konrad Lorenz suggested that dogs are capable of laughing. He says that it is during play that dogs actually appear to laugh. In his book Man Meets Dog, Lorenz describes it this way:

"...an invitation to play always follows; here the slightly opened jaws which reveal the tongue, and the tilted angle of the mouth which stretches almost from ear to ear give a still stronger impression of laughing.

This ‘laughing' is most often seen in dogs playing with an adored master and which become so excited that they soon start panting". (Source)

Laughing is awesome. Laughing dogs? Nothing could be more happiness-inducing in the world. Start your week right with this hilarious compilation of dogs
Via Huffington Post