Reward for mercy to an animal
فِي كُلِّ ذَاتِ كَبِدٍ رَطْبَةٍ أَجْرٌ
Fi kulli dhati kabidin ratbatin ajr.
"In every living being there is a reward."
Narrated by Abu Hurayrah. Sahih al-Bukhari 2363, Sahih Muslim 2244
A short reflection
The context: a man gave water to a thirsty dog and was forgiven. Mercy to whatever has a wet liver, that's the bar.