It is narrated from Sayyiduna Abu Huraira (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "A man was walking on the road when he became extremely thirsty. He saw a well, went down into it, and drank water. When he came out of the well, he saw a dog panting and licking mud out of thirst. He thought, 'This dog is suffering from thirst just as I was.' So he went down into the well again, filled his sock with water, held it in his mouth, climbed up, and gave the dog water to drink. Allah, the Glorious and Majestic, became pleased with him and forgave him." The Companions (may Allah be pleased with them) asked: "O Messenger of Allah (peace and blessings be upon him)! Is there a reward for us in giving water to animals?" He (peace and blessings be upon him) replied: "Why not? There is a reward for every living being with a moist liver."