I would encourage mine to go "potty" before and they loved it! I would put my two in the same one and then it was a battle for which direction to go in. I do have to admit that once I asked my sister to watch them so I could use the bathroom and as I was washing my hands, I heard a bump a couple or times. I ran out and they had taken the stairs full force. I felt horrible of course but they didnt seem to be bothered, kept chasing the cat, thats for sure. Still kept a closer eye on them after that lol