Well, most of my dogs have been the half-witted Aussies (wink!) or some mix thereof. If they could be taught by 9 weeks old, to ring a bell to go outside - your BC can learn it in a day. That way, if the dog trots past the door, and you missed the cue - you'd at least hear the bell? Because pups need to go out NOW.
I just hung a dog-collar bell from a string on the door that leads to the yard - as you open the door, say "go outside?" and ding the bell. They catch on real quick.
And I also agree that limiting the water access at first, will help? And having an older dog in the house? might help - when Jimmy was just 8 weeks old, he peed in the house, and Ike walked over, sniffed the puddle - then looked at Jimmy as if to say "DUDE! We don't do that in the house!". Jimmy never peed in the house after that! Ben took a few weeks - but he was SO tiny and the runt; and by then Ike had gone on to Rainbow places.....
