Here is a good example of stout-heartedness in horses:
Tirad ibn Wahib al-Numayri took part in a battle of the  Banu Numayr. They had killed ‘Ali ibn Salim ibn Malik, the governor of Raqqa, and had taken possession of the city. The battle was between them and this ‘Ali’s brother, Malik ibn Salim.175 Tirad ibn Wahib was riding a horse belonging to a noble breed, a horse of great value. It was struck by a spear in its side and its entrails were hanging out of it, but it continued to fight until the battle subsided. The horse returned to Raqqa with Tirad and then died.