Bumping this for you. This is the ex-pen that I bought for my Chipper.
Amazon.com: Iris 301515 CI-604 Commercial Grade... It is large enough for a doggie pillow and a piddle pad. I have been quite happy with it. It isn't very tall so if you have an escape artist you may have to look for a taller one. It is very easy to move/take apart. Read this thread: http://www.yorkietalk.com/forums/training/126837-wait-she-did-what.html I thought there were some very good suggestions in it. Good luck. For some reason the YT thread that I posted is not coming up. It is titled "Wait, she did what?! under the "training" section just where you are.