How do you know if an obstacle is too dangerous?

An obstacle is too dangerous when its physical construction, placement, or the horse's current level of preparation creates a realistic risk of injury to the horse, the handler, or the rider that cannot be adequately managed with the skills and equipment available. Physical danger signs in an obstacle itself include instability — a bridge that flexes excessively, rocks, or shifts underfoot when the horse steps on it — slippery surfaces that do not provide adequate traction for the horse's movement, sharp edges or protruding hardware that could cause cuts or punctures, dimensions that are too narrow for the horse to pass through without contact, height that creates a fall risk if the horse rushes, and construction materials that could collapse or break under the horse's weight. An obstacle placed on poor footing — wet grass, mud, sloped ground, or soft unstable surfaces — that was safe in another location may become genuinely dangerous in a new setting. Beyond the physical construction of the obstacle itself, the combination of the obstacle and the horse's current state creates danger: a horse that is too frightened to think clearly is dangerous in proximity to any obstacle because its unpredictable explosive movement becomes the hazard rather than the obstacle itself. The rider's or handler's inability to safely control the horse's movement in the obstacle area is the final factor — an obstacle that a skilled trainer could safely introduce to a frightened horse becomes too dangerous when the person present does not have the skill to manage the horse's reaction. When any of those conditions are present, the correct response is to modify the obstacle, improve the footing, reduce the horse's anxiety through more preparation, or call in more experienced help rather than proceeding with a situation that has clearly identifiable risks.