(41) باب فَضْلِ سَاقِي الْبَهَائِمِ الْمُحْتَرَمَةِ وَإِطْعَامِهَا
Abu Huraira reported Allah's Messenger (may pace be upon him) as saying:
A prostitute saw a dog moving around a well on a hot day and hanging out its tongue because of thirst. She drew water for it in her shoe and she was pardoned (for this act of hers).
Reference: Sahih Muslim 2245 a
In-book reference: Book 39, Hadith 211
USC-MSA web (English) reference(deprecated numbering scheme): Book 26, Hadith 5578