and another.

in the 1500s, houses had thatched roofs-thick straw-piled high, with no wood underneath.It was the only place for animals to get warm, so all the dogs, cats andother small animals (mice, bugs) lived in the roof. When it rained, itbecame slippery and sometimes the animals would slip and fall off the roof.Hence the saying "It's raining cats and dogs."