Hmm...
I've heard that when dogs do this its because they believe they are the dominant one in your relationship. To break them of the habit, you're supposed to have a staring contest with them. First one to break eye-contact loses. When my fiance moved in with me, Sabby started marking all of his (my fiance's) stuff. So I told Justin to have a staring contest with Sabby. It seemed to work. If you try it, let me know how it goes.
I've heard that when dogs do this its because they believe they are the dominant one in your relationship. To break them of the habit, you're supposed to have a staring contest with them. First one to break eye-contact loses. When my fiance moved in with me, Sabby started marking all of his (my fiance's) stuff. So I told Justin to have a staring contest with Sabby. It seemed to work. If you try it, let me know how it goes.