Pigs demonstrate remarkable cognitive abilities including tool use, social learning, self-awareness, and complex problem-solving — capacities that make barren intensive environments particularly welfare-relevant.
The intelligence of pigs is not merely an interesting scientific fact — it has direct welfare implications. Cognitively complex animals with strong motivational systems experience deprivation more acutely when those motivations are frustrated. A highly intelligent, curious, social animal kept in a barren, unchanging environment with no behavioral choices experiences a quality of suffering that may exceed what simpler animals experience in similar conditions. This is the welfare argument for enrichment beyond species-typical behavior: enrichment is not a luxury for pigs but a necessity given their cognitive complexity. Welfare science is developing better tools for assessing pig emotional states, moving beyond the absence of negative indicators toward measurement of positive welfare.