Before buying wood shavings be sure you are buying Aspen wood shavings, not pine and Cedar as they are toxic to rabbits.
I have seen people using pine and cedar under their wire cages trays, but I do not recommend, the fumes from softwood is known for causing liver failure. If you are concern about your bunny's health spend a little more and buy Hardwood Shavings like Aspen.
If your bunny ingest Aspen wood shavings it will cause no problems which is not the same if he ingest cedar or pine wood.
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