I heard Jurayy bin Kulaib narrate that ‘Ali ؓ said: The Messenger of Allah ﷺ forbade [for sacrifice] any animal that was missing most of its ear or horn. I asked Saʿeed bin al-Musayyab: What does missing most of its ear or horn mean? He said: When half or more [of an animalʿs ear or horn] is missing.
نَهَى رَسُولُ اللهِ ﷺ عَنْ عَضَبِ الْأُذُنِ وَالْقَرْنِ