Pig Intelligence and Sentience: What We Know Now

Research into pig cognition has revealed an intelligence that rivals dogs and primates, fundamentally challenging how we justify current farming practices.

Key Facts

Pigs can pass the mirror self-recognition test — an indicator of self-awareness found in few species
They demonstrate metacognition — awareness of the limits of their own knowledge — in experimental settings
Pigs show emotional contagion (empathy), adjusting their behaviour based on the emotional state of companions
They can learn and remember visual symbols, play video games, and navigate complex mazes
Pigs dream during REM sleep, suggesting a level of inner mental life similar to humans

Welfare Considerations

The scientific consensus on pig cognition is now clear: these are highly intelligent, emotionally complex animals with rich inner lives. They form long-term friendships, mourn losses within their social group, and show optimism and pessimism based on their living conditions — a direct measure of animal welfare state. Yet 1.4 billion pigs live in intensive systems worldwide, many in conditions that their cognitive complexity means they experience as profoundly aversive. The gap between what we know about pig sentience and how they are treated is one of the most striking ethical inconsistencies in modern society.

What You Can Do

Reduce or eliminate pork consumption as a response to evidence of pig sentience and suffering
Choose pork products from outdoor or free-range systems where pigs can express complex behaviours
Share credible pig cognition research with people who are curious about the ethics of pork consumption
Support research funding for pig welfare science and applied behavioural research
Advocate for mandatory minimum pen space for pigs based on behavioural rather than just body size metrics