I           A normal healthy patient

-no discernible disease;  animals entered for ovariohysterectomy, castration, declaw, cosmetic procedures

 

 II          A patient with mild systemic disease

-skin tumor, fracture without shock, cruciate repair, uncomplicated hernia, cryptorchidectomy, localized infection, compensated cardiac disease

 

 III        A patient with severe systemic disease

                        -fever, dehydration, anemia, cachexia, moderate hypovolemia

 

 IV        A patient with severe systemic disease that is a constant threat to life

-uremia, toxemia, severe dehydration or hypovolemia, severe anemia, cardiac decompensation, emaciation, high fever

 

 V         A moribund patient not expected to survive 24 hrs. with or without surgery

-extreme shock or dehydration, terminal malignancy or infection, severe trauma