Pigs are among the most cognitively sophisticated of all farmed animals, with intelligence comparable to dogs and exceeding that of three-year-old children in some tasks. Understanding pig intelligence has profound implications for how we think about their welfare.
The cognitive sophistication of pigs creates a significant ethical and welfare challenge for intensive pig farming. Animals capable of self-recognition, metacognition, and complex social reasoning have welfare interests that extend beyond avoiding pain to include social complexity, cognitive engagement, and meaningful environmental interaction. A pig confined to a barren pen without enrichment is not merely bored in a trivial sense — it is denied the environmental complexity its cognitive capacities are evolved to engage with, resulting in genuine psychological deprivation. The welfare case for substantial enrichment, sufficient space, and stable social groups is not merely about preventing stereotypy but about enabling pigs to live cognitive lives commensurate with their capabilities. This is the frontier of positive welfare science as applied to farmed animals.