YOU SAID:

Who let the dogs out, who, who , who

INTO JAPANESE

誰が、誰が、誰が、誰が犬を外に出した

BACK INTO ENGLISH

who, who, who, who let the dog out

INTO JAPANESE

誰、誰、誰、誰が犬を外に出した

BACK INTO ENGLISH

who, who, who, who let the dog out