Respiratory disorders in dogs can quickly become critical and are reported to be the second leading cause of cardiac arrest in canines. Therefore, it is necessary to take appropriate measures according to each patient’s condition. This, however, requires rapid and accurate disease severity assessments. In human medicine, scoring systems that incorporate physical examinations and blood tests results with respiratory function assessments exist, and enable more accurate severity assessments. In contrast, there are only a few reports on severity assessments that use tests other than respiratory function evaluations in veterinary medicine. Further, these evaluations usability remains unclear.