YOU SAID:
It’s Raining cats and dogs
INTO JAPANESE
それは 雨が土砂降り
BACK INTO ENGLISH
It's raining down
INTO JAPANESE
雨が降っている。
BACK INTO ENGLISH
It is raining.
INTO JAPANESE
雨が降っている。
BACK INTO ENGLISH
It is raining.
That didn't even make that much sense in English.