Volume 3, Book 43, Number 646:
Narrated Abu Huraira:
The Prophet said, “A man felt very thirsty while he was on the way, there he came across a well. He
went down the well, quenched his thirst and came out. Meanwhile he saw a dog panting and licking
mud because of excessive thirst. He said to himself, “This dog is suffering from thirst as I did.” So, he
went down the well again and filled his shoe with water and watered it. Allah thanked him for that
deed and forgave him. The people said, “O Allah’s Apostle! Is there a reward for us in serving the an –
imals?” He replied: “Yes, there is a reward for serving any animate (living being).” (See Hadith No.
551)