My first dog used to leave her collar in the woods... and that was the least of her antics. She hated to be confined and made Harry Houdini look like an amateur. I used to have to kennel her on occasion... when I tried a new place I'd ask to look at the enclosures. They never bwlieved me when I told them what they'd need to do differently... invariably when I returned I would hear escape stories. I never said "I told you so" but certainly wanted to.
I was supposed to drop her off one morning but had a change of plans at the last minute. That day the kennel burned, 4 dogs died in the fire.