I got Riley's x-pen from
www.petedge.com
It is this one:
ProSelect Suite Retreat Pet Pens | PetEdge.com
I no longer use it.
He has full run of the whole place, now.
I trained him to use a litter box with the peepee pads in it. I also got a diaper genie for the used pads, so there is no smell.
He goes outside, as well, but I feel better leaving him with a litter box in the corner, just in case he has to go.
I got the larger second nature purina litter box.
The Mini is the larger one.
Amazon.com: Second Nature Dog Litter Pan Minature...