Narrated Abu Huraira رضي الله عنه (May Allah be pleased with him): Allah's Apostle صلى الله عليه وسلم (Peace be upon him) said, "A prostitute was forgiven by Allah, because, passing by a panting dog near a well and seeing that the dog was about to die of thirst, she took off her shoe, and tying it with her head-cover she drew out some water for it. So, Allah forgave her because of that."

[Sahi Bukhari, Hadith no. 3321]

Narrated Asma bint Abi Bakr رضي الله عنها (May Allah be pleased with her): The Prophet صلى الله عليه وسلم (Peace be upon him) prayed the eclipse prayer, and then said, "Hell was displayed so close that I said, O my Lord ! Am I going to be one of its inhabitants?" Suddenly he saw a woman. I remember he(Prophet) said, who was being scratched by a cat. He said, "What is wrong with her?" He was told, "She had imprisoned it (i.e. the cat) till it died of hunger."

[Sahi Bukhari, Hadith no. 2364]

One day, the Prophet صلى الله عليه وسلم (Peace be upon him) went for a walk through Madina to meet with the Muslims and talk to them. After a while, he came to a garden (a farm) and went in. There was a man sitting under a tree, in the cool shade. There were many other Muslims in the garden, too. Then, the Blessed Prophet saw a camel standing in one corner of the garden. The camel was tied to a post. It was making a pitiful howling sound. The Blessed Prophet walked over to where the camel was tied up. As he got closer, he saw that the camel was crying. Big tears were rolling down its cheeks and making the fur on its face all wet. The Blessed Prophet felt great pity for the camel. He went up to it and stroked its fur, and wiped away its tears. The Blessed Prophet saw that the camel was very thin. After a while, the camel stopped crying and howling. It gave a snort, as camels do when they are pleased. The Blessed Prophet looked around at all the people standing in the garden. " Who is the owner of this camel?" he asked. The man who had been sitting beneath the tree stepped forward. " I am the owner of the camel, O Messenger of God!" he said. The Blessed Prophet told him that he had been very cruel to the camel. The poor animal was howling and crying because his owner made it work very hard, but did not give it enough to eat and drink. Everyone in the garden could see how thin the camel was and how cruelly the man had acted towards the camel. When the owner of the camel heard this, he began to feel ashamed. " Do you not fear Allah because of this camel?" The Blessed Prophet asked him.

[Sunan Abu Dawood, Hadith no. 2549, Authentic]