/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: JoannePuopolo https://cdn.slidesharecdn.com/profile-photo-JoannePuopolo-48x48.jpg?cb=1523142543 Dogs can understand human verbal instructions, hand signals, whistles, horns, clickers, beepers, scent ID's, and Frisbee flight paths. What do humans understand?