Stereotypic behaviors in horses — crib-biting, weaving, and box-walking — are indicators of chronic stress and unmet behavioral needs that require environmental rather than physical solutions.
Horse stereotypies are welfare sentinels: their presence indicates that an individual's environmental needs are not being met. They arise from chronic frustration — of social needs, movement needs, and forage access needs — in management systems that prioritize human convenience over equine biology. Once established, stereotypies cannot be effectively eliminated; prevention through good management — social housing, ad libitum forage, and adequate turnout — is the only effective approach. Physical devices that prevent expression of stereotypies cause additional suffering by blocking the animal's only coping mechanism without removing the underlying cause.