Research on play behavior in pigs reveals animals capable of joy, curiosity, and positive emotional states, with implications for how we evaluate and design pig production systems.
Pig play behavior provides a window into positive welfare — evidence that pigs can experience something like joy rather than merely the absence of suffering. Designing production systems that enable play requires space, enrichment, and social environments that most intensive systems do not currently provide. The welfare significance of play is not merely symbolic — play-deprived pigs in barren environments redirect energy into tail biting and aggression that causes physical harm to themselves and pen-mates. Enriched environments that enable play reduce these harmful behaviors while simultaneously providing evidence of positive emotional states. The monitoring of play behavior as a welfare indicator is an accessible tool for farmers to assess whether their pigs are experiencing positive welfare.