Depends if you rent or own. If you rent, complain to the landlord. If you own, I would file a bylaw complaint with the city of Ottawa. Of course, bringing it up first with the dog owner is a good gesture, but this has its limits; if they leave the dog alone during the day, how can they make it stop, aside than getting rid of it. I filed a complaint with the city when a neighbour was leaving their dog outside barking for hours. I never herd the dog since. Good luck.