How are the three opening quotes by W.H. Auden, the untitled folk song, and the fictional Sharp Cereals Professor significant to the novel?

Why do you think King opens Cujo with “Once upon a time”? What atmosphere does this establish early in the novel? What thematic meaning might this creative decision suggest?

King opted to structure his novel as one body of text without chapters. Do you think this benefited Cujo’s tone and intention, or would you have preferred a chapter organization? Why?