YOU SAID:

It's raining cats and dogs, i guess?

INTO JAPANESE

猫と犬の雨が降っていますね。

BACK INTO ENGLISH

It's raining cats and dogs, isn't it?

INTO JAPANESE

猫や犬の雨が降っていますね。

BACK INTO ENGLISH

It's raining cats and dogs.

INTO JAPANESE

大雨です。

BACK INTO ENGLISH

It's raining cats and dogs.