Keratoconjunctivitis sicca (KCS; “dry eye”) is one of the most common ophthalmic diseases affecting pet dogs. Despite its prevalence, it is underdiagnosed and therefore often not treated. My goal in writing this article is to encourage veterinarians to perform a Schirmer tear test regularly as part of a complete ophthalmic examination. Once a diagnosis of dry eye is established, treatment can be tailored to the individual patient’s needs.