YOU SAID:

who needs boys when you have dogs

INTO JAPANESE

あなたは犬がいるときに男の子が必要です

BACK INTO ENGLISH

You need a boy while the dog is in

INTO JAPANESE

犬がいる間に少年が必要です

BACK INTO ENGLISH

I need a boy while I have a dog

INTO JAPANESE

私は犬がいる間、私は少年が必要です