"I asked the Messenger of Allah (ﷺ) about the game caught by a trained dog. He said: 'If you mention the Name of Allah when you send your trained dog, then eat from what it catches for you. But if it eats from it, then do not eat it, for he only caught it for himself.' I said: 'O Messenger of Allah! What do you say about when our dogs get mixed with other dogs.' He said: 'You only mentioned the Name of Allah over your dog, you did not mention it over the others.'" Sufyan said: "He disliked for him to eat it."
Reference: Jami` at-Tirmidhi 1470 In-book : Book 18, Hadith 8 English translation : Vol. 3, Book 16, Hadith 1470
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