My mom got a black lab a few weeks ago. I am waiting to leave for the Army so I have been staying at home with the dog. She is now 3 months old. And in the last 3 weeks, I have gotten her completely house broken. She is a brilliant dog. For some reason, she would always go to the bathroom on my moms bedroom floor. I broke her of that and now there are no messes in the house. Except now she has peed twice on my moms bed. After the first time, my mom of course went and washed the sheets and blankets. But then, after they were clean, she did it again. Anybody know why she is doing this?