All dogs must have a harness Dogs taken out of xpens must always have a leash attached to the harness Please keep a firm grip on the leash. (homelesstoforever.com)
He is trained to be in a large xpen in the house rather than a crate, and has broken out of a regular wire crate before. (malinoisrescue.org)
I thought a conservative approach was best... a minimum of 2 weeks of no interaction except through xpen or crate. (patriciamcconnell.com)