Wolf started out in a pen because I couldn't get him in and out of a crate.  One night I heard him moving around, and then I heard the bell on his collar jingling as he trotted down the hall, and that was the end of the pen.   He's fine in the house when we're here, but I know I had to get him crate or cage trained to keep him in one place while we're gone or we travel.  He hated his first crate and wouldn't go near it.  He also outgrew it.  So, instead of buying a new crate we cleaned up the one Mack had as a puppy.  We put a new bed in it, and Wolf loves it!  He's even given up sleeping on the couch and has moved his supply of bo-bos and stuffies and squeaky toys to a spot just outside the crate where he can grab them as needed.  I think he's in there as I write this.  He's even stopped stashing stuff under my bed and the couches.

is there a logical explanatiion for this?

Kim