I have just recently rescued a dog from the pound and she is a wonderful girl. I just have a tiny problem. M-F I have a different schedule than on weekends and she seems to pee in the middle of the night on my days off but not the weekdays. I always take her out before bed and when I get up. When I am done I will find the spots in the middle of the dinning room floor. I have seen signs where she cowers when I sternly say no and bad girl but I really would like to fix the problem so this doesn't continue to happen.

Any advise?