مُوَطَّأُ مَالِكٍ
Muwatta Malik 1058
Game
وَحَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّهُ كَانَ يَقُولُ فِي الْكَلْبِ الْمُعَلَّمِ كُلْ مَا أَمْسَكَ عَلَيْكَ إِنْ قَتَلَ وَإِنْ لَمْ يَقْتُلْ .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar said about a trained dog, "Eat whatever it catches for you whether it eats from it or not."
Arabic/English book reference: Book 25, Hadith 5