Personally, I would start with the least offensive act, that of nicely confronting them and explaining that it is stressing the cats - and you too. Walking past the window, and letting the dogs stand and bark into it, are two entirely different situations - the latter being totally rude and inconsiderate. If the dog's owner gets an attitude with you, or if the situation continues, then I'd definitely look into the condo rules. The owner that you are renting from has the responsibility to see to it that you have a copy which you can refer to and take appropriate action on anything, if and when needed.