Detailed text transcripts for TV channel - KGO - 20140618:09:26:00
>> reporter: researcher mark beckoff who spent years analyzing dog's play, every nip, wag and bark in slow motion says there's more going on. he says he's discovered dogs share with us a sense of fairness and might even know right from wrong. >> you can say they're just playing. but, boy, they are rapidly exchanging signals. >> reporter: watch as this great dane invites a dog half its size to play. this move is called a play bow. it means i want to be your friend. >> there is no doubt about it. okay, saying you are okay. let's play. >> reporter: take a look at this, that bite looks fierce. but...
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