The dog knows love in spite of never having been taught anything about love. And man is continuously being taught love and man does not know love. The dog fully well knows that it is right to be loyal to the hand that feeds you. The dog knows, and the dog has never been trained in loyalty. But man? Man stabs in the back. No dog stabs in the back. And man has been given ample lessons on loyalty and fidelity.
Man has devised so many ways to try to become happy, to somehow get joy. But nothing in existence dies of heart attack as man does.