Khalid bin al-Walid (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) forbade eating the meat of horses, mules, donkeys and every predator with fangs.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19446
Thawr bin Yazid (may Allah have mercy on him) narrates with his chain that he (peace and blessings be upon him) forbade it on the Day of Khaybar.
This chain is mudtarib (inconsistent), and along with its inconsistency it contradicts the hadith of the trustworthy narrators.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19447
Al-Bukhari said: Salih bin Yahya bin al-Miqdam bin Ma'dikarib al-Kindi al-Shami narrates from his father; Thawr and Sulayman bin Sulaym narrated from him. There is reservation (nazar) about him.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19448
Musa bin Harun said: Salih bin Yahya is not known, nor is his father, except through his grandfather, and this is weak. And al-Waqidi claimed that Khalid bin al-Walid accepted Islam after the conquest of Khaybar.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19449