The uncle of Hazrat Abu Minhal Tai says that I asked Hazrat Abu Hurairah (may Allah be pleased with him) about hunting with a dog. He replied: Put a collar around the dog's neck that marks it as a trained dog, release it for hunting, and say "Bismillah" (In the name of Allah). Then whatever it hunts, eat it. However, if the dog has also eaten from it, then do not eat it.