Weaving is a repetitive movement stereotypy in stabled horses indicating poor welfare. Prevention through management change is far preferable to physical restriction.
A horse weaving in its stable - swaying rhythmically from side to side with fixed intensity - is an animal in psychological distress that has developed a coping mechanism it cannot unlearn. Stereotypies do not develop in horses whose social, dietary, and movement needs are met. They develop in horses confined for long periods, fed high-concentrate diets with inadequate forage, and deprived of social contact. Anti-weave devices physically prevent the movement but leave the underlying frustration unaddressed. The welfare solution is the management change that prevents stereotypy development.