Sayyiduna Adi bin Hatim (may Allah be pleased with him) says: I asked the Messenger of Allah (peace and blessings be upon him) about game hunted with the broad side of an arrow, and he (peace and blessings be upon him) said: "What the edge of the arrow strikes, eat; and what dies from being struck by the broad side of the arrow will be regarded as having died from the blow of a piece of wood." And I asked about game caught by a dog, and he (peace and blessings be upon him) said: "When you send your dog after game and mention the name of Allah, and the dog holds the game for you, then eat; if the dog has eaten anything from the game, then do not eat the game. If you find another dog along with your dog and you fear that perhaps that dog caught or killed the game, then still do not eat, because you mentioned the name of Allah when sending your own dog, not over the other."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيد والذبائح / 18873