Agree that spaying will help, but some buns just love to dig in carpet so that prob wont go away completely. For the carpet, pick up some heavy ceramic tiles from the hardware store (the big 12-14″ ones). You can place them over the trouble spots and that should help a lot, since buns will get obsessed over a particular area.
My carpet-digger buns also really loved cardboard cat scratchers as an alternative to chew. Grass or paper mats and phone books for shredding were also very popular.
For the litter box, I use a litter box screen instead of pee pads. If she’s a persistent chewer, the wire ones in the Binky Bunny store are really great. I had one for years until my pet sitter accidentally threw it out.
The other toy that has really saved my furniture lately is the “snak shak” log toy. It’s a bit controversial, controversial because it’s essentially rabbit-safe particle board, (wood shavings bound together with molasses and some other edible binder), but it’s very very hard so they don’t ingest a ton and keeps my bunnies occupied for hours. I usually give mine access to it for a few hours a day and only when they are roaming so they don’t chew things they aren’t supposed to.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.