French Bulldogs cope well without constant companionship and do great home alone.
As ex-racers used to confinement, Greyhounds often relax and sleep when left alone.
Boston Terriers are adaptable to being left alone for moderate periods of time.
Despite size, gentle Great Danes handle alone time well and won't get stressed.
Independent Shar Peis are calm when left alone at home. Low maintenance.
Chow Chows are very independent dogs that tolerate being left home alone well.
Bulldogs tend to sleep a lot and do fine left alone during work hours.