Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said, “A man suffered from thirst while he was walking on a journey. When he found a well, he climbed down into it and drank from it. Then he came out and saw a dog lolling its tongue from thirst and licking the ground. The man said: This dog has suffered thirst just as I have suffered from it. He climbed down into the well, filled his shoe with water, and caught it in his mouth as he climbed up. Then he gave the dog a drink. Allah appreciated his deed, so He forgave him.” They said, “O Messenger of Allah, is there a reward for charity even for the animals?” The Prophet said, “Yes, in every creature with a moist liver is a reward for charity.”
Source: Ṣaḥīḥ al-Bukhārī 6009, Ṣaḥīḥ Muslim 2244
Grade: Muttafaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Muslim
عَنْ أَبِي هُرَيْرَةَ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ بَيْنَمَا رَجُلٌ يَمْشِي بِطَرِيقٍ اشْتَدَّ عَلَيْهِ الْعَطَشُ فَوَجَدَ بِئْرًا فَنَزَلَ فِيهَا فَشَرِبَ ثُمَّ خَرَجَ فَإِذَا كَلْبٌ يَلْهَثُ يَأْكُلُ الثَّرَى مِنْ الْعَطَشِ فَقَالَ الرَّجُلُ لَقَدْ بَلَغَ هَذَا الْكَلْبَ مِنْ الْعَطَشِ مِثْلُ الَّذِي كَانَ بَلَغَ بِي فَنَزَلَ الْبِئْرَ فَمَلَأَ خُفَّهُ ثُمَّ أَمْسَكَهُ بِفِيهِ فَسَقَى الْكَلْبَ فَشَكَرَ اللَّهُ لَهُ فَغَفَرَ لَهُ قَالُوا يَا رَسُولَ اللَّهِ وَإِنَّ لَنَا فِي الْبَهَائِمِ أَجْرًا فَقَالَ نَعَمْ فِي كُلِّ ذَاتِ كَبِدٍ رَطْبَةٍ أَجْرٌ
6009 صحيح البخاري كتاب الأدب باب رحمة الناس والبهائم
2244 صحيح مسلم كتاب السلام باب فضل سقي البهائم المحترمة وإطعامها