It was narrated from 'Adiyy bin Hatim that he asked the Messenger of Allah about hunting and he said:
When you release your arrow or your dog, mentioned the name of Allah, and when your arrow kills (the game), then eat. He said: What if it gets away form me for a night, O Messenger of Allah? He said: If you find your arrow and you do not find the mark of anything else, then eat it. But if it falls into the water, do not eat it.