In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Jaabir [radiyallaahu anhu] said, “[Someone] went past the Prophet [sallal laahu alayhi wasallam] with a donkey that was branded on its face, so he said, ‘Has it not reached you that I indeed cursed one who brands animals on their faces or hits them on their faces?!’ So, he forbade that’”.
The hadeeth shows the proof that it is obligatory to be gentle to animals. In it is a prohibition against branding on the face because the face is honoured. It is not permissible for anyone to brand an animal’s or a man’s face, and likewise it is forbidden to hit on the face.
[At-taleeqaat Al-Maleehah Alaa Silsilah al-Ahaadeeth as-Saheehah. Vol 1. Page 325. Slightly paraphrased]