This seems to be a constant mistake of many (and constant concern of mine), but you should NOT feed chocolate to your rabbit, it is poisonous!
Here's a link to the post I made last week in response to another rabbit PotD whose owner mentioned that they fed chocolate to their rabbit:
Please read the above post (and the links mentioned within that post) to help keep your rabbit alive and healthy for a long, long time (there's a fun cartoon included as an added incentive to visit that message)!
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