Sayyiduna Zayd bin Khalid al-Juhani (may Allah be pleased with him) said: A Bedouin came to the Prophet (peace and blessings be upon him) and asked him about a found item (luqatah), and he (peace and blessings be upon him) said: "Announce it for one year, then take note of its bag and the cord it is tied with (or he said: its container). If its owner comes, give it to him; otherwise, spend it or make use of it."
He asked: O Messenger of Allah, what is the ruling on a stray sheep? He (peace and blessings be upon him) said: "It is for you, or for your brother, or for the wolf."
Then he asked about a stray camel, and the expression on his (peace and blessings be upon him) face changed, and he (peace and blessings be upon him) said: "What have you to do with it? It has its feet and its water-skin with it; it goes to the water and eats from the trees. Leave it until its owner finds it."
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 5230