It was narrated that 'Ali, may Allah be pleased with him, said:"The Messenger of Allah commanded us to examine the eyes and ears (of animals), and no0t to sacrifice and animals with its ears slit from the front, and animal with its ears slit form the back, a animal with its tail cut, nor an animals with a round hole in its ear."
أَخْبَرَنِي مُحَمَّدُ بْنُ آدَمَ، عَنْ عَبْدِ الرَّحِيمِ، - وَهُوَ ابْنُ سُلَيْمَانَ - عَنْ زَكَرِيَّا بْنِ أَبِي زَائِدَةَ، عَنْ أَبِي إِسْحَاقَ، عَنْ شُرَيْحِ بْنِ النُّعْمَانِ، عَنْ عَلِيٍّ، رضى الله عنه قَالَ أَمَرَنَا رَسُولُ اللَّهِ صلى الله عليه وسلم أَنْ نَسْتَشْرِفَ الْعَيْنَ وَالأُذُنَ وَأَنْ لاَ نُضَحِّيَ بِمُقَابَلَةٍ وَلاَ مُدَابَرَةٍ وَلاَ بَتْرَاءَ وَلاَ خَرْقَاءَ .
Nesai
The Book of ad-Dahaya (Sacrifices) • Hadith 4372