[Buster Bailey]

I transitioned from crate training to a pen with my 2 yorkies about 2 months ago. It worked REALLY well for about the first month-and-a-half (now they are back in their crate which I will explain below). Before leaving them alone in their pen, I played with them in the pen, put their crate in there, and their doggy bed. The first day I didn't lock them in there, but called them into their pen several times to play & sometimes they got a treat. You said you tried treats - but maybe you could try "hiding" some treats - like in the corner of the bed, crate, pen, under a toy, etc. That way your little one will be busy in the pen for at least a while. I left my yorkies with a small tasty treat whenever I left (in a kong or a Busy Buddy toy), said "bye-bye" ONE time only, and left. Sounds liek you may have tried this, but if not, hope it helps! So Buster & Bailey are actually back in their crate right now (for the past week or so) because they ate the walls! We have an area in our basement that we blocked off for their "play pen" with sheetrock walls, and when we got home 4 days in a row, they had eaten a chunk out of the walls! I covered up one spot, they chewed on another...so until we get some type of border up (I'm thinking plywood), they are in their crate. Good luck to you!