Man's best friend, loyal life companions, dogs have many things in common with humans, sharing their way of behaving and being, to the extent that at times they act like they're the ones in charge. They too like to play, they're curious about discovering new things, and it's not hard to figure out whether they're happy or sad, shy or nervous. However, spending some time watching them, while sitting on a park bench, makes you think about the many things that make them different from us, and so good-hearted.