YOU SAID:

raining cats and dogs aint it?

INTO JAPANESE

雨が降っている猫や犬はそれではありませんか？

BACK INTO ENGLISH

Isn't that the cat or dog that's raining?

INTO JAPANESE

雨が降っているのは猫や犬ではないですか？

BACK INTO ENGLISH

Isn't it raining cats and dogs?

INTO JAPANESE

猫や犬が雨が降っていませんか？

BACK INTO ENGLISH

Are cats and dogs raining?

INTO JAPANESE

猫と犬は雨が降っていますか？

BACK INTO ENGLISH

Are cats and dogs raining?