What it is?

Quidding is the dropping out of the mouth of inadequately chewed fiber.

Causes

The main cause for this behavior is a painful condition in the mouth. Consider, first of all, periodontitis (gum disease) whether or not due to gaps between the teeth (diastemata).Severe wear and tear, tooth fractures, etc., can also cause these symptoms.

The second main cause is a lack of chewing ability of the horse. This typically occurs in older horses due to the loss of relief/enamel and teeth.

Until proven otherwise, any horse that quids is seriously suspected of having a significant dental problem. 

What can you do?

Regular inspection and care of the horse's teeth is the key to preventing and treating dental problems and thus quidding. In addition to dental treatment, medication and nutrition modification is sometimes necessary.