How do I fix a cutting horse whose stop has broken down in cattle work?

A cutting horse whose stop quality has deteriorated specifically in the cattle work context — stopping correctly in arena work without cattle but bracing, running past the stop cue, or failing to stop reliably when cattle excitement is elevated — has developed a pattern in which the cattle environment overrides the trained stop response, and the correction requires addressing the gap between the arena stop and the cattle-work stop specifically rather than simply doing more arena stop work. The training correction begins by identifying at what cattle excitement level the stop breaks down — does it hold in quiet cattle exposure but deteriorate in active cutting work, or does it deteriorate even in the presence of cattle without specific cutting demands? This identification determines where to begin the reconstruction. If the stop holds in quiet cattle presence but breaks down in active work, the correction involves returning to controlled cattle situations where the pace of the work can be managed — slower cattle, smaller pens, more deliberate work — to a level where the stop remains available, then rebuilding the intensity gradually while maintaining the stop standard. If the stop deteriorates even in quiet cattle presence, the correction involves returning to arena stop work until the stop is deeply enough confirmed that it holds under mild distraction, then reintroducing cattle exposure at the lowest-demand level while maintaining the stop standard. In all cases, the stop must be corrected every time it breaks down in the cattle context rather than being allowed to slide — consistent acceptance of a below-standard stop in cattle work teaches the horse that cattle conditions are an exception to the stop requirement, which deepens the pattern rather than resolving it.