Their house is immaculate. The floors gleam. The sofa is fluffed. The windows, even the window on top of the door, are invisible. Objects placed on the coffee table - a small vase, a candy dish - are safe where they sit. The living room smells like spring. Flowers are being coaxed in the picture window and the scent of new life fills the house. When you drink coffee or Coke, you don't find a dog hair at the bottom of the glass. When you flop into bed at night, dog hair doesn't float around the room…