The Prophet ﷺ said, "When you send your dog and mention the name of Allah, then it catches the game and kills it, eat from it. But if it has eaten from it, do not eat, for it caught it only for itself. If your dog mingles with other dogs over which the name of Allah was not mentioned, and they catch and kill the game, do not eat, for you do not know which of them killed it. If you shoot at game and find it a day or two later with no mark on it except that of your arrow, eat from it. But if it has fallen into water, do not eat."
عن النبي ﷺ قال: إذا أرسلت كلبك وسميت فأمسك وقتل، فكل، وإن أكل فلا تأكل، فإنما أمسك على نفسه، وإذا خالط كلابا لم يذكر اسم الله عليها فأمسكن وقتلن فلا تأكل، فإنك لا تدرى أيها قتل، وإن رميت الصيد فوجدته بعد يوم أو يومين، ليس به إلا أثر سهمك، فكل، وإن وقع في الماء فلا تأكل.
Bukhari narrated it in the Book of Hunting and Slaughtered Animals (5484), and Muslim in the Book of Hunting and Slaughtered Animals (1929:6), both through the route of Asim, from Shaybi, from Adi bin Hatim, as mentioned. The wording given is Bukhari's, while Muslim's wording is, "If it is away from you for a day."Something to the same effect is reported from Ibn Abbas, who said, the Messenger of Allah ﷺ said, "If you release the dog and it eats from the game, do not eat it, for it has only caught it for itself. But if you release it and it kills without eating, then eat it, for it has caught it for its owner." Ahmad narrated it (2049) from Asbat, who said, Abu Ishaq Shaybani told us, from Hammad, from Ibrahim, from Ibn Abbas, as mentioned.Ibrahim here is Ibrahim bin Yazid Nakhai, the jurist of the people of Kufa, but he did not narrate from any of the companions of the Prophet ﷺ, even though he encountered a number of them and once saw Ayesha in a dream, as stated by Ahmad bin Abdullah Ajli. This means there is a break in the chain between him and Ibn Abbas.