Hi T., I am sorry about your dog smell - that must be very exasperating since you don't even have a dog! Since there is no carpet that is holding the odor, it must have permeated the baseboard or even possibly the sheetrock on the walls. If the dog urinated along the edge of the room, the smell may be in the baseboard (if there is any). You might try getting down & smelling the baseboard to see if the odor is stronger there. If so, I would consider replacing it. You might also do the same "sniffing" technique to see if the odor is permeated somehow into the tiles. Perhaps you will have to rip those up and put something else down. If the odor was simply dog odor which some dogs, particularly older dogs and certain breeds, emit, it should have been eliminated with your dehumidifier, washing the floor, candles and opening the windows to air out. I fear it may be from the dog urinating and could have seeped into the grout or even through the grout to the floor below. If it is not in the baseboard, it must be in the floor tiles somehow. Have you tried washing the walls? I suppose if the dog was in the room 24/7 and was a smelly dog, washing the walls might help. After washing the walls, I would even re-paint them - I would rather smell fresh paint than dog!! Hope these suggestions are a little help. If all else fails, you could try a good-quality air purifier such as Shaklee's Air Source. It does 3,000 sq ft. However, you really need to eliminate the source before you even consider an Air Source or dehumidifier. Hope this helps. E. Taft ____@____.com emilytaft.com