‘A monk asked Zhaozhou, Great Master Zhenji, “Does a dog have buddha nature?”
Clarify the meaning of this question. A dog is a dog. It is not that this monk was asking whether a dog has buddha nature or not. He was asking whether an iron person still practices the way’ (Shobogenzo Bussho)

Where else would you expect to find buddha nature? What do you think this looked like to the monk?