སེམས་ཅན་གེ་ར་རང་གི་ཕ་མ་ཨིན།༽Animals have always been regarded in Buddhist thought as sentient beings

Animals have always been regarded in Buddhist thought as sentient beings. The doctrine of rebirth held that any human could be reborn as animal, and any animal could be reborn as a human. An animal might be a reborn dead relative, and anybody who looked far enough back through their series of lives might come to believe every animal to be a distant relative. The Buddha expounded that sentient beings currently living in the animal realm have been our mothers, brothers, sisters, fathers, children, friends in past rebirths. One could not, therefore, make a hard distinction between moral rules applicable to animals and those applicable to humans; ultimately humans and animals were part of a single family. They are all interconnected.