[Really?!]

We have always been aware that our now 7 month old boxer puppy was a dominant dog but recently she has found a creative way of reasserting herself that we do not appreciate. First some history.. we got our pup when she was 9 weeks old. She has always been confident and sweet. She plays hard and often but is not aggressive at all toward anyone or anything. You can touch her face and feet, take her toys (with some level of tug of war play though we are working on "drop it" to limit this even more), take her bones and food without incident. My husband is home all of the time right now so he is home with her most. Recently he was playing fetch with her while watching TV and she started peeing right in front of him. She had been outside and as I said is fully trained. He immediately told her NO! and took her outside. The next day he was on the phone and she peed on his feet. Again he stopped everything telling her NO! and took her outside followed by time in her kennel and ignoring her. That night we started the 48 hours of ignoring which we completed successfully. Since than we have been acting more dominant and seeing results from her but today I went outside to work in the front yard and as my husband was getting ready to join me she peed on his feet again. I am wondering if there is any other additional information that could help us with this problem. As I said we are in the middle of some serious alpha dog training but I was wondering if there is any other help anyone can give us. I am also curious about what it may mean that she is only acting poorly towards him. Does this mean that she already feels she is dominant over me or is it just the difference in my husband's approach that is bringing it out in her?