My brother had been bitten by our dog once. After that incident, he(our dog) seemed depressed. It was unintended but he knew he had hurt my brother. All day, he was not eating. He just stooped down at one corner and we knew he wants to tell he was sorry.
Well, it was amazing for as dog as he was, he was able to feel sorry.
I hope people were like dogs, know when to stoop down once they knew they had hurt someone. People treat dogs as a lower form of beings. But at least they feel for hypocrites like us. They know when to swallow pride.