Wow, you'd think that if it could withstand a cougar (and if it costs $110), than it would withstand Nebo.... Hey, that means Nebo is more powerful than a cougar! (or so he wishes. )
I have the same problem with Skylar and Ethan (though Ethan doesn't have to stay in a crate anymore).
Skylar has to sleep on the plastic because he'd completely shred anything in there. Ethan did the same thing, but not as bad as Skylar does it.
Good luck in trying to find something durable enough to survive Nebo!