Why Do We Say Raining Cats and Dogs?

The expression “raining cats and dogs” is one of the most colorful phrases in the English language, used to describe a very heavy downpour, yet its true origin remains uncertain. Unlike many common sayings whose beginnings can be traced to a specific author, event, or historical practice, this phrase has inspired centuries of speculation and folklore.

Today it simply means that rain is falling in torrents, but historians and linguists continue to debate how cats and dogs became associated with extreme weather. One of the most popular explanations is also one of the least likely. According to a long-repeated story, the phrase originated in medieval England,

where heavy rains supposedly washed dead animals from thatched roofs and into the streets. Cats and small dogs were said to climb onto roofs for warmth, only to be swept away during storms. Although this tale is frequently repeated in books, magazines, and on the internet, there is little historical evidence that such events were common enough to create a lasting expression. Most language scholars regard this explanation as a myth rather than a genuine etymology. Another theory points to ancient mythology.

In Norse tradition, dogs were sometimes associated with storms and wind, while cats were linked to weather-related beliefs through their connection with certain deities. Some writers have suggested that violent storms filled with symbolic cats and dogs could have inspired the phrase. However, no direct linguistic evidence connects these myths to the English expression,

making this explanation intriguing but unproven. A more plausible possibility involves the use of animals as metaphors for chaos. In seventeenth-century England, cats and dogs were often portrayed as natural enemies whose fights represented disorder and commotion. A severe storm could therefore be described figuratively as if it were throwing down battling cats and dogs from the sky.

Similar animal-based imagery appears throughout English literature of the period, making this explanation attractive to many researchers. The phrase can be traced in written form to the seventeenth century. One of the earliest known appearances occurs in the writings of the English poet and satirist Jonathan Swift. In his 1738 collection A Complete Collection of Genteel and Ingenious Conversation, Swift used wording that referred to rain

involving cats and dogs, helping to popularize the expression. By the eighteenth century, the phrase was already recognizable to English readers and was being used as a humorous exaggeration rather than a literal description. Over time it became firmly established in both British and American English. Language experts generally agree that the exact origin may never be known.

Many idioms emerge gradually from spoken language, leaving few clues behind. What is certain is that “raining cats and dogs” survived because it paints a vivid picture. The image is absurd, memorable, and expressive, allowing speakers to emphasize just how fiercely the rain is falling.

Even though modern weather forecasts rely on precise measurements rather than colorful idioms, the phrase remains popular centuries after its first recorded appearances and continues to be one of the most recognizable examples of imaginative English speech.