What would a cat and dog make together?

Can dogs and cats mate? No, cats and dogs are too different to mate and produce offspring. Even though different species sometimes can produce hybrids (like lions and tigers) they have to be very closely related and it just isn’t possible in the case of cats and dogs.

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What is the origin of the phrase “it’s raining cats and dogs?”

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We don’t know. The phrase might have its roots in Norse mythology, medieval superstitions, the obsolete word catadupe (waterfall), or dead animals in the streets of Britain being picked up by storm waters.

The first recorded use of a phrase similar to “raining cats and dogs” was in the 1651 collection of poems Olor Iscanus. British poet Henry Vaughan referred to a roof that was secure against “dogs and cats rained in shower.”