Tying-up causes severe muscle pain and distress in horses, with multiple underlying causes requiring accurate diagnosis for effective prevention.
Tying-up causes acute, intense muscle pain that is visibly distressing to horses - affected animals stand rigidly, sweat profusely, and show the extreme anxiety of a prey species unable to flee. The pain response is equivalent to severe cramp across major muscle groups. In severe cases, myoglobin released from damaged muscles can cause kidney failure, adding further welfare harm. Recurrent tying-up represents ongoing welfare harm that is entirely manageable with accurate diagnosis and appropriate dietary and exercise management. The most common error is treating episodes without investigating the underlying cause, leading to repeated welfare-harmful episodes that specific management would prevent.