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Review title: Doesn't work.
Product review: My two gerbils were very young when I got this (you know how the say you can't teach and old dog new tricks), and it still didn't work. My gerbils just piled litter in there to the brim at first. Now I put some in there already and they use it as a lookout bedroom kind of thing which is OK; it doesn't work as far as training them to go potty in there but it's cool to see them sleeping in there or whatever. Maybe other people will have better luck with it than I did.
