Dogs get by with a minimum of creature comforts. They don't order down comforters or mattresses you can adjust differently on each side of the bed. If they need to cool off in the summer, dogs take a dip in the creek. In the winter, it's nature, not some fancy furrier, that provides a thicker coat. They trust because they are trustworthy, not fickle or swayed by someone's bank account or current circumstances.
Dogs sleep well.
You can read their dreams, tell exactly when they're running rabbits or warding off danger. They dream with their whole bodies. They sleep well because they have no guilt. They have no guilt because they do so little wrong. Dogs show affection.