Abu Huraira (may Allah be pleased with him) reports that the Messenger of Allah (peace be upon him) said: "No charity is obligatory upon a Muslim for his slave and his horse except for the charity of Fitr."
Hadith Referenceصحيح ابن خزيمه / جماع أبواب صدقة المواشي من الإبل والبقر والغنم / 2288