I use a crate and an exercise pen. Since I am training Emmy to go potty 100% outside, I put the pee pee pads lined up under a blanket in her exercise pen. She doesn't know they are there and if she does have an accident at least there is no mess on the floor. I have her sleep in her crate and when I go to school or work I have her in the exercise pen. So far we have had no accidents in either on!! I just started keeping her in the exercise pen though about a week ago because I think she is ready and can hold it enough! Hope that helps out a little!!!
-Ashley & Emmy