Pigs engage in genuine play behavior including object play, locomotor play, and social play that indicates positive welfare states and provides a measurable indicator of good farm conditions.
Play behavior in pigs is not a luxury but a welfare indicator with diagnostic value. Animals do not play when hungry, ill, socially stressed, or in chronic pain. The presence of spontaneous play indicates that the five welfare needs are being met at a level that allows discretionary positive activity. Farms with good enrichment, appropriate stocking density, and low disease burden show measurably higher play frequency. This makes play observation a practical welfare audit tool that captures positive welfare rather than only the absence of suffering.