YOU SAID:
It was raining cats and dogs
INTO JAPANESE
雨が降っていた猫や犬だった
BACK INTO ENGLISH
It was a cat or a dog that was raining.
INTO JAPANESE
雨が降っていた猫や犬だった。
BACK INTO ENGLISH
It was a cat or a dog that was raining.
That didn't even make that much sense in English.