
Hello Jayne ...first of all , have a look [link http://www.champdogs.co.uk/cgi-bin/board/topic_show.pl?tid=14670&hilite=House%20Training#93836]HERE[/link]. The advice for House Training contained on that thread is as valid for a 17 week old pup as it is for a 17 week old.
You need to clean the area that he pees in with biological soap powder and hot water ....to try and eliminate the scent. You then need to TAKE him onto the balcony ...and stay there with him until he preforms ..then give lots and lots of praise.
Do not tell him off when he has an accident ...he doesn't *know* he is just responding to your body language :)
He is still a baby ....and you should be taking him outside every 15 minutes or after eating and drinking ...keep up with the praise when he does well and he will get the hang of it. Watch for signs that wants to go ..circling around etc
HTH
Melody :)