In the first book featuring the character (The Cat in the Hat, 1957), the Cat brings a cheerful, exotic and exuberant form of chaos to a household of two young children one rainy day while their mother is out. Bringing with him two creatures appropriately named Thing One and Thing Two, the Cat performs all sorts of wacky tricks to amuse the children, with mixed results. The Cat's antics are vainly opposed by the family pet, who is a sentient and articulate goldfish. The children (Sally and her older brother, who serves as the narrator) ultimately prove exemplary latchkey children, capturing the Things and bringing the Cat under control. He cleans up the house on his way out, disappearing seconds before the mother arrives.
The book has been popular since its publication, and a logo featuring the Cat adorns all Dr. Seuss publications and animated films produced after Cat in the Hat.
Seuss wrote the book because he felt that there should be more entertaining and fun material for beginning readers. From a literary point of view, the book is a feat of skill, since it simultaneously maintains a strict triple meter, keeps to a tiny vocabulary, and tells an entertaining tale. Literary critics occasionally write recreational essays about the work, having fun with issues such as the absence of the mother and the psychological or symbolic characterizations of Cat, Things, and Fish. This book is written in a style common to Dr. Seuss, anapestic tetrameter (see Dr. Seuss's meters).
The Cat in the Hat has also been translated into Latin with the title Cattus Petasatus and into Yiddish with the title "di Kats der Payats".
The story is 1626 words in length and uses a vocabulary of only 236 unique words, of which 54 occur exactly once and 33 twice. Only a single word – another – has three syllables, while 14 have two and the remaining 221 are monosyllabic. The longest words are something and playthings.
The Cat in the Hat has gone on to sell 7.2 million copies in the United States alone (up to 2000), making it the 9th best-selling hardcover children's book of all time.
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