They don't lick you then bite to draw blood. In a world of hypocrisy and betrayal, dogs are direct. They never lie. They think with their noses, and the nose is the most primitive and infallible organ. If we could all live by our sense of smell, our lives would be much simpler.
Dogs have infallible bullshit detectors.
Moreover, they heed them as humans never do. Rejoice and kick up your heels after a good shit. Love the one who feeds you. Curl up with the one who strokes your belly. Cherish a good master and lick him into enduring servitude.