YOU SAID:

it's rains cats and dogs

INTO JAPANESE

猫と犬は雨が降っています

BACK INTO ENGLISH

cat and dog it's raining

INTO JAPANESE

猫と犬、雨が降っています

BACK INTO ENGLISH

cat and dog, it's raining

INTO JAPANESE

猫と犬、雨が降っています

BACK INTO ENGLISH

cat and dog, it's raining