Our expert says:
Your puppy is probably afraid of the dark! Try putting a light on outside. If this doesn't work then you may have to have a toilet inside for night times, at least for a couple of months. Make a toilet with a shallow box lined with plastic and containing a piece of instant lawn or just soil (whatever surface she is going on outside). Once she is using it you can move it gradually towards the open window and then after eventually outside. Keep it outside during the day and clean it every morning. You can also try feeding her her last meal a bit earlier and taking away all food and water at night. This way she may not need to poo at night.
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