The Apostle of Allaah ( sal Allaahu alayhi wa sallam ) forbade us to use a bone or dung for wiping.
Sunan Abi Dawud Book 1, Hadith 38
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Sunan Abi Dawud Book 1, Hadith 37 Next Hadith → A deputation of the jinn came to the Prophet (ﷺ) and said: O Muhammad, forbid your community to cleans themselves with a bone or dung or charcoal, for in them Allah has provided sustenance for us. So the Prophet (ﷺ) forbade them to do so.

Sunan Abi Dawud Book 1, Hadith 39