Not to start any arguments about your pets, but aren’t we just projecting our human traits onto these animals? Dogs don’t smile. In fact, when “meeting” a new dog, it’s recommended that humans not smile, as it is interpreted as a baring of the teeth—a sign of aggression.
@thankgodforbeef—What does a laughing dog sound like?
@johnpowell—I doubt that animals feel emotion. Besides, humor is not an emotion.
@delirium—Great link, and the closest to answering the question. Though I’m not entirely convinced.
@segdeha—Yes, but are the sounds made by these animals actual laughter—do they find something funny? Or are we trying to project our senses of humor on animals?