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@Abbie The hardest part of this marking issue is cleaning. They really need to odor-neutralize EVERYWHERE the dog is marking. If it is truly marking, the distinctive element is that it’s usually occuring at entrances/exits to important areas and most often on a vertical or raised surface. And all of it must be now made odor-neutral for them to have any success. Deep cleaning with an enzymatic, commercial grade odor neutralizing product (many of the pet-store brands simply don’t work). I’m not current on what products are the best – perhaps other members can chime in on this?