Is Your Dog Laughing At You Behind Your Back?

Dogs are capable of laughing, and they typically do so when they are playing. Canine laughter begins with the doggy equivalent of smiling but also includes a sound that is much like panting. Animal behaviorist Patricia Simonet recorded those sounds while dogs played. On analyzing the recordings, she found that they involved a broader range of frequencies than regular dog panting. So, what makes a dog laugh? What can we do to make them laugh? Are they already laughing about us behind our back? We'll try to figure out what tickles their funny bone.