Positive Emotions in Pigs: Beyond the Absence of Suffering

Modern animal welfare science recognises that good welfare requires positive emotional states, not merely the absence of negative ones. Pigs provide a compelling case study in positive welfare.

Key Facts

The Five Domains model of animal welfare includes a fifth domain — "mental state" — encompassing positive as well as negative emotions.
Pigs show measurable indicators of positive emotional states including play behaviour, anticipatory responses, and optimistic cognitive biases.
Play in pigs (running, jumping, social play) is strongly associated with positive welfare and declines when pigs are stressed or ill.
Cognitive bias tests measure whether animals in positive states make more optimistic choices — pigs in enriched environments are consistently more optimistic.
Environmental enrichment, social stability, and good health are associated with increased positive emotional expression in pigs.
Pigs show contagious joy responses — a pig that observes another pig receiving a positive experience shows positive emotional indicators itself.
High-welfare farming systems that track positive welfare indicators, not just negative ones (lameness, lesion scores), achieve better overall outcomes.
The Welfare Quality protocol for pigs includes positive welfare criteria alongside traditional health and management measures.

Welfare Considerations

The recognition that animal welfare encompasses positive emotional states represents a fundamental shift in how we assess and improve welfare. A pig that is free from pain and disease but lives in a barren, unstimulating environment may be free from suffering but is not experiencing good welfare — the absence of misery is not the same as the presence of flourishing. Positive welfare indicators for pigs — play, exploration, social bonding, curiosity — provide a more complete picture of welfare quality and a higher target for producers and welfare systems to aim for. The practical implication is that welfare improvement programmes should include active provision of enrichment, positive social interactions, and conditions that enable pigs to express the full range of their behavioural repertoire.

What You Can Do

Support welfare certification standards that include positive welfare indicators, not just absence of harm.
Choose pork from systems that provide enrichment and space for natural play and exploration.
Advocate for welfare assessment methods that include positive emotional state evaluation.
Support research into reliable, practical positive welfare indicators for farm animals.
Engage with the concept of positive welfare when discussing animal welfare with others.
Encourage farmers and industry to adopt the Five Domains model as a welfare assessment framework.