Why is it 'raining cats and dogs'?
Way back in England, where the English language obviously originated, houses had thatched roofs - they were piled high with straw, with no wood underneath.
It was the only place for animals to get warm, so all the cats and other small animals (mice, bugs) lived in the roof.
When it rained it became slippery and sometimes the animals would slip and fall off the roof.
Hence the saying “It’s raining cats and dogs.”