Musannaf Ibn Abi Shaybah 20758 — A dog sent after its game when

Usamah bin Zayd (may Allah have mercy on him) said: I asked al-Qasim (may Allah have mercy on him): If a man sends his trained dog after game and it catches the game and kills it, but the man finds some untrained dogs with his dog, what is the ruling? Al-Qasim said: If he knows that his trained dog killed it, he may eat it; and if he is in doubt that some other dog may have joined it in killing it, he should not eat it.