From Sahih Muslim (Hadith 4973):
Adi b. Hatim reported:I asked Allah's Messenger (ﷺ) saying: We are a people who hunt with these (trained) dogs, then (what should we do)? Thereupon he (the Holy Prophet) said: When you set of your trained dogs having recited the name of Allah, then eat what these (hounds) have caught for you, even if it (the game) is killed, provided (the hunting dog) has not eaten (any part of the game). If it has eaten (the game), then you don't eat it as I fear that it might have caught for its own self. And do not eat it if other dogs have joined your trained dogs
Reference: Muslim 4973