Sahih al-Bukhari 5483
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."
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا مُحَمَّدُ بْنُ فُضَيْلٍ، عَنْ بَيَانٍ، عَنِ الشَّعْبِيِّ، عَنْ عَدِيِّ بْنِ حَاتِمٍ، قَالَ سَأَلْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم قُلْتُ إِنَّا قَوْمٌ نَصِيدُ بِهَذِهِ الْكِلاَبِ‏.‏ فَقَالَ ‏
"‏ 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 ‏"‏‏.‏