Although Dr. Seuss was best-known for his standalone books, he wrote quite a few short stories, four of which are collected in Horton and the Kwuggerbug and More Lost Stories. Those stories include: "Horton and the Kwuggerbug", which tells the story of a Kwuggerbug which lands on Horton the Elephant's trunk, "Marco Comes Late," which tells the story of Marco from And to Think That I Saw It on Mulberry Street explaining to his teacher why he was late, "How Officer Pat Saved the Whole Town," which follows Officer Pat, who sees a gnat about to disturb a cat, and "The Hoobub and the Grinch," which tells the story of a con-artist named the Grinch who says that a piece of green string is better than the sun.
When it was released, Horton and the Kwuggerbug and More Lost Stories received very positive reviews. The Washington Times, for example, loved the book, writing that "If you loved Dr. Seuss as a child (and as an adult), these little-known stories will bring back many fond memories."