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 Umarsaid about a trained dog, "Eat whatever it catches for you whether iteats from it or not." Translation Not Available

Book Ref: Muwatta Imam Malik Book 25 Hadith 1058
Web Ref:  Muwatta Imam Malik Book 25 Hadith 5