It is narrated from Sayyiduna Zayd bin Khalid al-Juhani (may Allah be pleased with him) that a man asked the Prophet (peace and blessings be upon him) about a found item (luqatah), and he (peace and blessings be upon him) said: "Announce it for one year, then take note of the cord it is tied with, then spend it. If its owner comes, give it to him."
He said: O Messenger of Allah, what is the ruling on a stray sheep? He (peace and blessings be upon him) said: "Take it, for it is for you, or for your brother, or for the wolf."
He said: O Messenger of Allah, what is the ruling on a stray camel? At this the Messenger of Allah (peace and blessings be upon him) became angry until his (peace and blessings be upon him) cheeks (or he said: his face) turned red, then he said: "What have you to do with it? It has its feet and its water-skin with it, until its owner finds it."
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 5236