It is truly up to you and what your life needs are. I for one utilize two cases. One in the room and one in the front room, and when I am finished with potty preparing, I dispose of the containers. I know individuals who utilize the case in the room during the evening, however a xpen in the parlor during the day while they are grinding away. A few people use tyke doors and keep the little dog in the kitchen while they are potty preparing. You need to do what is best for your circumstance and your doggie. I have the enormous size cases for my Shelties, and they do fine and dandy in them. It is simply up to you.