I have two toy poodles. They are both female and not spayed. One of them (5 years old) has, over the past couple months, started peeing in the hallway every morning. She has a dog door and always uses it (well, 99% of the time). She only uses the hallway in the morning right after she gets up. If you catch her, you can take her outside and she goes out there, but you have to be super fast. Does anyone have ideas why or what I can do to stop her?