Pigs possess cognitive abilities comparable to dogs and surpassing those of many species we treat with far greater welfare concern. Understanding pig intelligence has profound implications for how we evaluate their treatment in farming systems.
The cognitive complexity of pigs creates a profound ethical challenge for modern animal agriculture. These are animals who can play video games, recognize themselves, form lasting social bonds, and experience positive and negative emotional states in ways that our best science can detect and measure. Yet the vast majority of the world's 1.4 billion pigs live in systems designed around production efficiency rather than the behavioral and psychological needs of cognitively complex beings. The cognitive bias test result is perhaps the most compelling welfare indicator: pigs in barren, unstimulating environments approach ambiguous stimuli pessimistically — they have learned to expect bad outcomes. Those in enriched environments approach the same stimuli optimistically. Environments create emotional states; our farming systems are creating pessimism at industrial scale.