... my Maggie can pretty much chew her way through anything. We paid $2000 last year for surgery to remove washrags, socks, and many many blanket bits from her digestive tract, so, we hadn't been able to put anything at the bottom of her crate. Unfortunately, this irritated her sensitive skin, which promptly got infected. So, I got online, did a bunch of research, and bought her a Kuranda bed for her crate. I got home...and there was only one tiny little scratch on the aluminum. No teeth marks. Nothing. Maggie loves it so much, I'm thinking about buying her another one (we can't get it out of her crate very easily...it's made out of welded one inch bars). I don't know what I would have done without it!