In 1955, Disney released “Lady and the Tramp.” Based on Ward Greene’s novel, “Happy Dan, The Cynical Dog,” the film told the story of Lady, a Cocker Spaniel, who lived with a refined, upper-middle-class family, and Tramp, a male stray mixed-breed dog. The film had beautiful animation and subtle storytelling. For example, as Caroline Siede pointed out in “The A.V. Club,” “the idea that Lady is pregnant with Tramp’s puppies is conveyed solely in subtext, when her two respectable friends offer to marry her. What goes unspoken is the idea that they’re providing an escape from the stigma of being an unmarried mother.” The film was about puppy love, but it also made bold statements about the privileges associated with money and status, and keen observations about a simpler way of life.