Just as a side comment, I don't use a Crate except for transportation when a "strange" Dog is of concern, but...

Maybe some of you guys will remember WAY BACK in grade School, the Teachers had a very heavy duty chair. Oak or something really strong an they were very heavy. Probably 30 or so Lbs.

Anyway, I had one of those Chairs in an Office, where I let my (then) Old English roam the whole building for security purposes. It took him about six months to chew the legs off of one of those Chairs.