What condition is characterized by extra eyelashes in dogs?

Distichiasis is characterized by the presence of extra eyelashes that grow from the eyelid margin. These abnormal eyelashes can emerge from the meibomian glands, which are responsible for producing the oil that helps lubricate the eye. When dogs have distichiasis, these additional hairs can rub against the eyeball, causing discomfort, irritation, and potentially leading to corneal damage or other eye-related issues.

In contrast, entropion refers to a condition where the eyelids roll inward, causing the lashes to irritate the surface of the eye. Blepharitis is an inflammation of the eyelids that can result from infection, allergies, or other irritations, but it does not specifically involve extra eyelashes. Conjunctivitis, commonly known as "pink eye," involves inflammation of the conjunctiva and does not relate to the presence of additional eyelashes either. Understanding these differences helps in identifying the specific eye conditions affecting dogs, particularly in a grooming or veterinary context.