I adopted a Manchester mix in June. She was totally housebroken and had no accidents (she's a little over a year). I was thrilled, to say the least. In the past couple of weeks, she has taken to pooping on the bed...once when I was laying there!! I also found a pile on the couch. She has a doggie door that she knows how to use. The poop is quite firm so it's not like she can't hold it. Any suggestions would be greatly appreciated.