YOU SAID:

the black dog went out the back door

INTO JAPANESE

黒い犬は裏口から出て行った

BACK INTO ENGLISH

The black dog walked out the back door

INTO JAPANESE

黒い犬は裏口から歩いた

BACK INTO ENGLISH

The black dog walked through the back door

INTO JAPANESE

黒い犬は裏口を歩いた

BACK INTO ENGLISH

The black dog walked through the back door