Behavioral
Depression
Complete loss of interest in food or water (may hang head over bowl but not drink or eat)
Hiding for several days
Tucking feet under the body for extended periods
Resting chin on the floor for extended periods
Physiological
Vomiting
Diarrhea (often contains blood)
Dehydration
Anorexia (weight loss)
Fever
Anemia
Poor coat condition
Ataxia (other neurological symptoms if the virus attacks the brain)