Other sources of dry eye include drug
toxicity (antibiotics such as sulphadiazine and sulphasalazine can cause temporary or permanent dry eye in some animals), drug - induced reaction (atropine and topical anesthetics temporarily reduce tear production), neurological impairment (damage to the nerves leading to the lacrimal glands), removal of the third eyelid (see Cherry Eye),
systemic disease (e.g. distemper), chronic conjunctivitis, trauma to the tear glands, hypothyroidism, congenital disease (some dogs are born
without lacrimal glands), breed predisposition.