cartoons, Punch Magazine, B&W, B/W, black & white, black and white, 20th century, Twentieth Century, dogs, pets, animals, 1920s, 1921, Twenties, public transport, underground, tube trains, tubes, crowds, crowded, children, boys, bell boys, porters, walking, walks, exercises, exercising, leads, leashes, aggression, aggressive, growling, growls, threats, threatens, afraid, baring, teeth, passengers, man, men, males, woman, women, females, leashed, illustrations, humor, humour, scared, scares, scaring, scary, ferocious, snarled, snarling, snarls, fears, fierce, frightened, frightening, frightens, growled, threatening, threatened, walked, Punch cartoons, Stampa, George Loraine