So far, so good. My guys honestly don't chew much...knock on wood! Every so often they really get on a tear and I lose another piece of furniture but it's seldom. So far, I've not had any problems with that. Our issue is nesting. If it can hold up to Fos digging holes in it then it's pretty stout. He can literally dig a hole through the couch cushions...and has! It's amazing! Anyway, I would have to say if it holds up to Fos then it would hold up to chewing. The elevated bed is made out of PVC and slip joints. Dh screwed the corners so they would squeek all night long. The new cover has pretty wide gussets so nothing is touching at the corners.
So far, no one has tried to eat the regular covers....agai n, knock on wood...