Name a common error in handling cattle during a show.

Over-tightening the lead is indeed a common error when handling cattle during a show. This practice can cause discomfort or anxiety for the animal, leading to stress and potential behavioral issues. A proper lead should allow enough slack to enable the animal to move comfortably while still providing the handler with control. When the lead is too tight, it not only may cause physical distress but can also hinder the animal's ability to exhibit its natural movements and posture, which are critical for judging.

In contrast, walking too slowly beside the animal might not create the same level of discomfort, although it could affect presentation. Not feeding the animal before the show can impact its appearance and energy levels but is not a direct handling issue during the show itself. Ignoring the judge's presence may reflect poor showmanship and awareness, but it does not directly influence the wellbeing of the animal in the same way that over-tightening the lead does. Thus, ensuring appropriate handling techniques, such as maintaining a comfortable lead tension, is crucial for both the animal's welfare and the overall success in showmanship.