Why We Love Dogs, Eat Pigs, and Wear Cows: An Introduction to Carnism (2009) is a book by American social psychologist Melanie Joy about the belief system and psychology of meat eating, or "carnism". Joy coined the term carnism in 2001 and developed it in her doctoral dissertation in 2003. Carnism is a subset of speciesism, and contrasts with ethical veganism, the moral commitment to abstain from consuming or using meat and other animal products. In 2020, an anniversary edition of the book was published by publisher Red Wheel.