It wasnarrated that Abu Sa'eed Al-Khudri said:
"We bought a ram forsacrifice, then a wolf tore some flesh from its rump and ears. Weasked the Prophet (ﷺ) and he told us to offer it as a sacrifice." (ES)
English reference (ES): Vol. 4, Book 26, Hadith 3146 (ES)
Arabic reference (ES): Book 26, Hadith 3266 (ES)