I don't know if you'll be coming back but if you do, did you use an enzyme cleaner when cleaning up after all the dogs?
I ask because I've had success with that kind of cleaner when teaching my over a year old dog to not mark in the house, even if my roomie's dog did.
I used Nature's Miracld, and it really helps because it's suppose to break down and eliminate all the potty smells that the dogs can smell even if we can't. I soak up with a paper towel as much pee as I can. Then I spray an "oopsie" area with a generous amount of Nature's Miracle, and I even go outside the "oopsie" area, just to make sure I got it all. I super saturate it and let it sit for 5 mins. Then I soak up the remainder with more paper towels. That works on my carpeted floors and the laminate in the bathroom and kitchen.