It was suppose to be a pen but we just set it up like a fence and connected to house. It's right outside our patio door so makes it easier for all of us and potty training is so much better now.I'm thinking of doing this too! Mine go on wee wee pads now coz we're out a fair bit during the day but since we have a courtyard I was thinking of setting up a pen outside. Turf at one end for going potty on and a spot at the other end for eating their raw bones (coz my husband is a germaphobe and hates when they take their chicken wings for walkies inside). Did you just use a flex pen? My mum bought me one but i've never used it.