This study was performed to investigate the signalment, cause and clinical feature of corneal diseases of dogs in Korea. One hundred eighty-four dogs(273 eyes) with corneal diseases were examined and classified into congenital, inflammatory and metabolic diseases. Inflammatory diseases were subclassified into nonulcerative keratitis and ulcerative keratitis. The most prevalent corneal disease type was inflammatory disease(93.7%) and nonulcerative keratitis(58.6%) is more prevalent than ulcerative keratitis(35.1%) in the inflammatory diseases. The main cause of nonulcerative keratitis was keratoconjunctivitis sicca(19.0%) whereas that of ulcerative keratitis was trauma(9.9%). The most common breed with corneal disease was Shih Tzu(49.5%). The affected mean age was $6.4{pm}4.1$ years old. The prevalence rate of corneal diseases were slightly higher in female(56.8%) than in male(43.2%). The data of corneal diseases in dogs obtained from this study will be utilized in prevention, diagnosis and treatment of corneal diseases in dogs and client education.