Mughirah bin Hadhf al-Absi said: We were with Sayyiduna Ali (may Allah be pleased with him) in al-Rahbah when a man from Hamdan came driving a cow along with its calf, and he said: I bought it to sacrifice it, and it has given birth. He said: Do not drink of its milk except what is left over from its calf, and when the day of sacrifice comes, slaughter it and its calf on behalf of seven (people).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19192
Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) said: I bought a sheep to sacrifice and went out, and a wolf seized its fat tail. I asked the Prophet (peace and blessings be upon him) about it, and he (peace and blessings be upon him) said: "Sacrifice it."
(b) In the narration of Sufyan: We bought a ram to sacrifice, and a wolf cut off its fat tail, or part of its fat tail. I asked the Prophet (peace and blessings be upon him), and he ordered me to sacrifice it.
Jabir (al-Ju'fi), however, is not used as evidence.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19193
Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "There is no harm in sacrificing an animal whose tail has been cut off."
(b) Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) said that a man asked the Prophet (peace and blessings be upon him) about a sheep whose tail a wolf had cut off: Should he sacrifice it? He (peace and blessings be upon him) said: "Sacrifice it."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19194