I've also got a very intelligent - and naughty - bun, and sympathize, because they're pros at figuring out how to get into trouble! (As you already know, Usagi_Chan.
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Like Naturestee, I use a combination of "No"-ing (in an "I'm not gonna tolerate any nonesense from you" voice, if need be), hand-clapping, stomping (like a rabbit), and a spray bottle set to "mist" if necessary. i haven't tried clicker training, but have a feeling I ought to.
A few things I've learned (reiterating some points others have made):
1. buns learn really fast
2. No means "no" and my bun will respond to a firm "No" (a gruff tone of voice really helps)
3. Love and patience go a long, long way with behavior problems
4. Praising and fussing over the bun when he/she is doing the right thing is really good - positive reinforcement! (Sometimes you can see the wheels turning in their heads - "should i be bad or good?" it takes a lot of watchfulness to be able to help the bun learn better manners/behaviors.)
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know this isn't easy - my bunny is a reformed biter (well, super-hard nipper). Sometimes it's really hard to not lose patience. But I think that given time, you and Thumper can get past some of the most difficult stuf you're facing. (provided you stow all those appliance cords, that is.
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My guess is that if she is anything like my bun, she's enjoying the challenge - and the attention, even if the only reaction she's getting is a negative one. I don't have any easy answers to this stuff, but I have found that encouragement - and learning more about rabbit behavior and personality - have been very helpful.
hang in there! I believe all three of you can learn to live together more happily (and with less chewing of "wrong" items).