Sayyiduna Adi bin Hatim (may Allah be pleased with him) asked the Messenger of Allah (peace and blessings be upon him) about hunting, and he (peace and blessings be upon him) said: "When you send your dog after game, say 'Bismillah' (In the name of Allah) and 'Allahu akbar' (Allah is the Greatest). If you reach the game before it dies, mention the name of Allah while slaughtering it; and if you find the game killed and the dog has not eaten from it, then eat, for it has caught it for you. If it has eaten something from the game, you should not eat it, because the dog has caught it for itself."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيد والذبائح / 18875