Pigs are among the most intelligent animals on earth. Understanding their cognitive abilities reveals the welfare implications of standard intensive farming practices.
Pig intelligence welfare is one of the most ethically compelling arguments for improving farm pig conditions. A highly intelligent animal confined in a barren, enrichment-free environment experiences a form of cognitive deprivation that is qualitatively different from the suffering of a less cognitively complex animal. Pigs denied rooting opportunities, social complexity, and problem-solving challenges experience persistent frustration. Their capacity for pessimistic cognitive bias - demonstrated when welfare is poor - shows that their psychological state is affected by their circumstances in ways that parallel human experience of chronic boredom or helplessness. The intelligence of pigs is not an argument against farming them, but it is a compelling argument for farming them in conditions that respect their cognitive complexity.