Cats and dogs are the most popular pets.Do you keep a cat ,or a dog,too?

"It's raining cats and dogs"is a much used idiom.How come it means "it is raining very heavily"?That has something to do with a western myth.According to the myth,both the cat and the dog are sevants of the god of storm.

You may laugh at the expression"enough to make a cat laugh",It means "very funny".When a clumsy fat boy slips on a banana skin ,it is enough to make a cat laugh.