Why does my horse overrun the cow at the fence?

Overrunning the cow at the fence — driving past the cow's position so far that the horse loses positional contact before making the turn — is one of the most common fence work problems and reflects a specific failure in the rate management and acceleration timing that correct fence work requires. The most common cause is accelerating too early: the horse begins its drive past the cow when there is too much fence remaining, arrives in position ahead of the cow well before the turn location, and continues running because there is no immediate target for the rollback turn. This leaves the horse significantly past the cow when it finally turns, disconnected from the cow and needing to reconnect rather than making a continuous drive-turn-drive sequence. A second cause is simply too much speed throughout the fence work — a horse that is working at the upper edge of its controllable speed range has less ability to modulate its pace and is more likely to carry momentum past the correct turn position than a horse working at a speed it can manage. The training correction for overrunning focuses on two specific skills: developing more precise rate control so the horse can match the cow's pace without drifting ahead, and developing sharper recognition of the correct acceleration timing so the horse begins the drive past the cow later in the fence run. Working at slower speeds on less challenging cattle — where the horse has more time to read the correct moment to accelerate — develops the timing recognition that gets carried forward to faster work. Horses that consistently overrun may also benefit from specific exercises that develop the stop and rollback mechanics in the cattle context, reinforcing that the correct response to being ahead of the cow is a sharp turn rather than continuing down the fence.