"The Messenger of Allah (ﷺ) prohibited that an animal with a A'dab (stump) horn or ear should be slaughtered as a sacrifice." Qatadah (one of the narrators) said: "So I mentioned this to Sa'eed bin Al-Musayyab and he said: 'The A'dab is that which equals or more than that.'"
Reference: Jami` at-Tirmidhi 1504 In-book : Book 19, Hadith 15 English translation : Vol. 3, Book 17, Hadith 1504
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