Sayyiduna Adi bin Hatim (may Allah be pleased with him) said: I said to the Messenger of Allah (peace and blessings be upon him): We are a people who hunt with these very dogs? He (peace and blessings be upon him) said: "When you send your trained dogs and mention the name of Allah over them, then eat what they hold back for you, even if they kill it, unless the dog itself eats. If it eats, then do not eat, for I fear that it held it back for itself. And if other dogs join them, then do not eat."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14225