This is an idiom I hear often from non-native speakers. But I don’t think I have ever heard a native speaker use it.
This idiom is said to originate from times when houses had low thatched roofs made of thick straw, piled high, with no wood underneath. They were the only place for the little animals to get warm. So all the pets; dogs, cats and other small animals, mice, rats, bugs, all lived in the roof. When it rained it became slippery so sometimes the animals would slip and fall off the roof. Thus the saying, “it’s raining cats and dogs.”
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