The earliest recorded evidence of animal welfare dates back to ancient Greece, where philosophers such as Pythagoras and Aristotle discussed the treatment of animals. Pythagoras, known for his Pythagorean theorem, was a vocal advocate for animal rights, arguing that animals possess souls and should be treated with compassion. Aristotle, on the other hand, believed that animals were sentient beings but did not possess the same level of rationality as humans.

Both oppose "Ag-Gag" legislation (laws that criminalize undercover investigations of farms and slaughterhouses). Both believe the public has a right to see how their food is produced.