Quidding is:

Quidding refers to the behavior where a horse drops partially chewed food from its mouth while attempting to eat. This often occurs due to dental problems, such as sharp points on the teeth or other dental issues, which make chewing difficult and uncomfortable for the horse. As a result, the animal may not be able to effectively process its food and may let it fall out instead of swallowing it.

The significance of recognizing quidding lies in its implications for a horse's health and well-being. If a horse is quidding, it may not be getting the necessary nutrition, leading to weight loss or other health problems. Addressing the underlying dental issues is essential for correcting this behavior and ensuring that the horse can eat properly.

The other options describe separate behaviors or conditions that do not directly relate to the action of dropping food in the process of eating, which is the essence of quidding.