COVER YOUR DOG POTTY BOX WHEN IT RAINS!
If there is rain in the forecast you must cover your dog potty box or make sure that you dog potty box is in an area that is sheltered by a patio cover. Because the box is designed to be leak proof, if it is rained on it will fill up with water and spill onto your patio.
You can cover your dog potty box easily with two large kitchen trash bags if needed.