It depends on how long i'm gonna be gone. If I'm gone for less than a few hours, i'll leave him out of his crate. If i'm gone all day, he definitely gets his crate. I started work a couple of weeks ago and I made the mistake of leaving Lou out of his crate. Well, he destroyed 3 boxes of cereal (he'd never gotten them before so I didn't think about it), and somehow got into the cabinet where I keep some food. 2 boxes of girls scout cookies, 2 packets of beef jerky, a box of sandwich bags, a bag of trash bags, 2 small plants were in small pieces all over my room. It was a disaster! There was food all over the place, inside and out (he has a doggie door into the fenced yard). But then again, I left him out today, for about 5 hours and he did absolutely nothing bad. I was better about putting things out of his reach and left him w/a few big beef bones, so I think that helped.