Amr bin Shu'ayb narrates from his father, from his grandfather (may Allah be pleased with him), that Sayyiduna Abu Tha'labah (may Allah be pleased with him), a Bedouin, said: O Messenger of Allah (peace and blessings be upon him), I have trained dogs; give me a ruling about their game. He (peace and blessings be upon him) said: "When your dog is trained and holds the game, eat, whether you slaughter it or not." The narrator says: What if the dog eats from it? He said: "Even if the dog eats from the game."
(b) Amr bin Shu'ayb narrates from a man of Hudhayl that he asked about game caught by a dog, and he (peace and blessings be upon him) said: "Eat, whether the dog has eaten from the game or not."
The hadith of al-Sha'bi from Adi (may Allah be pleased with him) is more authentic than the hadith of Dawud bin Amr al-Dimashqi and the hadith of Amr bin Shu'ayb, and Allah knows best; and because of this (narration of Shu'bah) the hadith of Amr became ma'lul (defective).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيد والذبائح / 18884