كتاب الذبائح والصيد
Read the English translation first, with the original Arabic directly underneath.
Narrated Adi bin Hatim:
I asked Allah's Messenger (ﷺ) . "We hunt with the help of these hounds." He said, "If you let loose your trained hounds after a game, and mention the name of Allah, then you can eat what the hounds catch for you, even if they killed the game. But you should not eat of it if the hound has eaten of it, for then it is likely that the hound has caught the game for itself. And if other hounds join your hound in hunting the game, then do not eat of it."
إِذَا أَرْسَلْتَ كِلاَبَكَ الْمُعَلَّمَةَ وَذَكَرْتَ اسْمَ اللَّهِ، فَكُلْ مِمَّا أَمْسَكْنَ عَلَيْكُمْ، وَإِنْ قَتَلْنَ إِلاَّ أَنْ يَأْكُلَ الْكَلْبُ، فَإِنِّي أَخَافُ أَنْ يَكُونَ إِنَّمَا أَمْسَكَهُ عَلَى نَفْسِهِ، وَإِنْ خَالَطَهَا كِلاَبٌ مِنْ غَيْرِهَا فَلاَ تَأْكُلْ