Left-behind

"At Sammy's wedding Marguerite looked around and saw the old relatives who had disappeared from sight once her father had moved to a better neighborhood. Now there they were again, the derelicts and left-behinds."

"Breakfast when they return is at the little kitchen table where Max has eaten thousands of meals, and every morning, without fail, the old man slides a ripped-off chunk of toast and a piece of banana to the dog at his feet, precisely the behavior experts at Guiding Eyes for the Blind had warned against because it can turn a service dog into a food hound who noses along restaurant tabletops in search of left-behinds."