"Well, he's a male dog, what do you expect him to do?" is a cop-out. Yes, marking is a natural male dog behavior. But so is urinating wherever they please, and we wouldn't tolerate that indoors. Dogs know the difference between a tree and a person, or a lamppost and a living room couch. What they don't know, unless you teach them, is that there should be a social or behavioral distinction in terms of marking.

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