Pig welfare science has advanced rapidly, revealing complex cognitive and emotional lives that challenge conventional farming practices. Understanding what the evidence shows is essential for advocates, farmers, and policymakers working to improve pig welfare.
The scientific evidence on pig cognition and emotion has clear implications for farming systems. Pigs need social contact, environmental complexity, and opportunities for exploration to maintain positive welfare states. Systems that deny these — bare concrete flooring, individual confinement, early weaning, and physical alterations without analgesia — cause measurable psychological suffering. Positive welfare indicators such as play frequency, pro-social interactions with pen-mates, and optimistic cognitive bias in ambiguous task contexts provide a window into pig emotional life that allows welfare to be quantified, not just assumed. The practical challenge is translating welfare science into production system reform at scale. Evidence consistently shows that higher-welfare systems with group housing, enrichment, and outdoor access are associated with better health outcomes as well as better welfare outcomes — making welfare and productivity increasingly complementary rather than opposed.