Since he's lifting his leg than it is probably a behavioral problem. Sounds like he's marking his territory. Which is a dominance issue.
Have you ever enrolled him into obedience classes?
I agree with Gina. I would close him off in one room. That in itself might help, or it may at least help you catch him the act and maybe getting a better idea on what causes him to go.
You want to look for a product that neutralizes ordors. Natures Miracle is awesome!
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