Pain recognition in farm animals has historically been poor due to stoic behavioral responses and economic disincentives to treatment, but validated pain assessment tools are changing practice.
For most of the history of animal agriculture, farm animal pain was systematically underrecognized and undertreated. Behavioral stoicism — adaptive for prey species that hide vulnerability — was misinterpreted as insensitivity. The development and validation of grimace scales for multiple species has provided objective tools for pain detection that do not depend on vocalization. These tools are changing clinical practice in veterinary medicine and are beginning to influence farm management. The remaining challenge is overcoming economic barriers to pain treatment and building a farming culture that treats pain relief as an ethical obligation rather than an optional expense.