Messenger of Allah ﷺ prohibited the eating of donkey's meat. Narrated Az-Zuhri: The Prophet ﷺ prohibited the eating of beasts having fangs.  

حَرَّمَ رَسُولُ اللَّهِ ﷺ لُحُومَ الْحُمُرِ الأَهْلِيَّةِ  

Messenger of Allah ﷺ forbade the eating of donkey-meat.  

نَهَى النَّبِيُّ ﷺ عَنْ أَكْلِ لُحُومِ الْحُمُرِ الأَهْلِيَّةِ  

We were afflicted with hunger during the besiege of Khaibar, and when it was the day of (the battle of) Khaibar, we slaughtered the donkeys and when the pots got boiling (with their meat). Allah's Apostle made an announcement that all the pots should be upset and that nobody should eat anything of the meat of the donkeys. We thought that the Prophet ﷺ prohibited that because the Khumus had not been taken out of the booty (i.e. donkeys); other people said, "He prohibited eating them for ever." The sub-narrator added, "I asked Saʿid bin Jubair who said, 'He has made the eating of donkeys' meat illegal for ever.")  

سَمِعْتُ ابْنَ أَبِي أَوْفَى ؓ يَقُولُ أَصَابَتْنَا مَجَاعَةٌ لَيَالِيَ خَيْبَرَ فَلَمَّا كَانَ يَوْمُ خَيْبَرَ وَقَعْنَا فِي الْحُمُرِ الأَهْلِيَّةِ فَانْتَحَرْنَاهَا فَلَمَّا غَلَتِ الْقُدُورُ نَادَى مُنَادِي رَسُولِ اللَّهِ ﷺ اكْفَئُوا الْقُدُورَ فَلاَ تَطْعَمُوا مِنْ لُحُومِ الْحُمُرِ شَيْئًا قَالَ عَبْدُ اللَّهِ فَقُلْنَا إِنَّمَا نَهَى النَّبِيُّ ﷺ لأَنَّهَا لَمْ تُخَمَّسْ قَالَ وَقَالَ آخَرُونَ حَرَّمَهَا الْبَتَّةَ وَسَأَلْتُ سَعِيدَ بْنَ جُبَيْرٍ فَقَالَ حَرَّمَهَا الْبَتَّةَ  

That when they were in the company of the Prophet, they got some donkeys which they (slaughtered and) cooked. Then the announcer of the Prophet ﷺ said, "Turn the cooking pots upside down (i.e. throw out the meat).  

أَنَّهُمْ كَانُوا مَعَ النَّبِيِّ ﷺ فَأَصَابُوا حُمُرًا فَطَبَخُوهَا فَنَادَى مُنَادِي النَّبِيِّ ﷺ: أَكْفِئُوا الْقُدُورَ۔  

I do not know whether the Prophet ﷺ forbade the eating of donkey-meat (temporarily) because they were the beasts of burden for the people, and he disliked that their means of transportation should be lost, or he forbade it on the day of Khaibar permanently.  

لاَ أَدْرِي أَنَهَى عَنْهُ رَسُولُ اللَّهِ ﷺ مِنْ أَجْلِ أَنَّهُ كَانَ حَمُولَةَ النَّاسِ فَكَرِهَ أَنْ تَذْهَبَ حَمُولَتُهُمْ أَوْ حَرَّمَهُ فِي يَوْمِ خَيْبَرَ لَحْمَ الْحُمُرِ الأَهْلِيَّةِ  

On the day of Khaibar the Prophet ﷺ saw fires being lighted. He asked, "Why are these fires being lighted?" The people replied that they were cooking the meat of donkeys. He said, "Break the pots and throw away their contents." The people said, "Shall we throw away their contents and wash the pots (rather than break them)?" He said, "Wash them."  

أَنَّ النَّبِيَّ ﷺ رَأَى نِيرَانًا تُوقَدُ يَوْمَ خَيْبَرَ قَالَ عَلَى مَا تُوقَدُ هَذِهِ النِّيرَانُ قَالُوا عَلَى الْحُمُرِ الإِنْسِيَّةِ قَالَ اكْسِرُوهَا وَأَهْرِقُوهَا قَالُوا أَلاَ نُهْرِيقُهَا وَنَغْسِلُهَا قَالَ اغْسِلُوا قَالَ أَبُو عَبْد اللَّهِ كَانَ ابْنُ أَبِي أُوَيْسٍ يَقُولُ الْحُمُرِ الْأَنْسِيَّةِ بِنَصْبِ الْأَلِفِ وَالنُّونِ