We call our little Chihuahua-terrier mix our cordless dust buster. Wherever we happen to sit to eat, she positions herself underneath our feet so she can retrieve any dropped crumbs. She particularly enjoyed standing beneath our daughter’s middle son when my wife kept him. Pig Pen, we call him—and for obvious reasons. The way he eats causes him to leave many crumbs behind. Sometimes, whole chunks of food. But, of course, our little mutt didn’t complain. …