What symptom is associated with dry eye in dogs?

The symptom associated with dry eye in dogs, also known as keratoconjunctivitis sicca, is crusty, irritated eyes. This condition occurs when there is an insufficient production of tears, leading to dryness and inflammation of the eye's surface. As a consequence, the eyes may become irritated and crusty due to lack of moisture and the potential for secondary infections or irritation from environmental factors.

In contrast, wet, shiny eyes typically indicate an excess production of tears or some form of eye irritation, while brightly colored irises are not a symptom of any eye condition but rather a characteristic of the dog's physical appearance. Increased tearing is not a symptom of dry eye, as this condition specifically involves reduced tear production rather than increased tearing.