YOU SAID:

the cow jumped over a large, blue potato with a dog on it's back

INTO JAPANESE

牛は背中に犬が乗った大きな青いジャガイモを飛び越えた

BACK INTO ENGLISH

Cow jumped over big blue potato with dog on back

INTO JAPANESE

牛は背中に犬と大きな青いジャガイモを飛び越えた

BACK INTO ENGLISH

Cow jumped over big blue potato with dog on back