My Roxy hasn't chewed on anything expensive (yet). She did play with the mouse on my computer though. Deleted all of my emails. Changed the date to December (I don't know how she did all this) Turned my Anti-virus program off. She did things that I don't know how to do. Found teeth marks on the mouse or I wouldn't have known that she did it. For only being 9 months old, she is really good.
She did chew a small hole in the cushion on the sofa. Hubby thought she was chewing her toy!! Loves to chew on old tissues or toilet paper holders.