What is a major penalty in working cow horse?

Major penalties in working cow horse are significant score deductions assigned for specific serious errors or rule violations that materially affect the quality or completeness of the run — deductions that are large enough to eliminate a run's competitiveness regardless of how well the rest of the work was executed. The specific major penalty amounts and the infractions that trigger them are defined in the applicable rulebook for each governing body, and they differ somewhat between NRCHA, AQHA, and other competition formats. In the reining phase, major penalties typically include missed lead changes — where both leads do not change simultaneously — and significant pattern errors. In the cattle work, losing the cow to the open arena is a major penalty in most formats because it represents a complete failure of cattle control. Breaking the barrier in timed events is a major penalty that adds significant time or score deduction regardless of the run's other qualities. Equipment violations such as using prohibited bits, illegal tie-downs, or other disallowed equipment are major penalties that can result in disqualification. In some formats, specific behavioral violations — the horse rearing, bucking, or otherwise creating a safety concern — are penalized as major infractions. The practical importance of understanding major penalties for competitors is that the risk-reward calculation of attempting difficult or aggressive cattle work must account for the penalty cost of the errors that aggressive work makes more likely — a major penalty typically costs more than the credit earned by the difficult work that produced it.