Changes

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  |-

  |<center>'''Class 1'''</center>   

  |<center>'''Class 1'''</center>   

  |<center>Asymptomatic or mild disease. Weight loss, reduced exercise tolerance or an occasional cough may be seen, No radiographic signs or laboratory abnormalities.</center>

  |'''Asymptomatic or mild disease'''

*Weight loss, reduced exercise tolerance or an occasional cough may be seen.

*No radiographic signs or laboratory abnormalities.

  |-

  |-

  |<center>'''Class 2'''</center>  

  |<center>'''Class 2'''</center>  

  |<center>Moderate disease. Animal coughs occasionally ahd shows mild-to-moderate exercise intolerance. Lung sounds may be increase, and radiography may show mild-to-moderate changes, e.g. right ventricular enlargement. Anemia and proteinuria may be present.</center>

  |'''Moderate disease'''

*Animal coughs occasionally and shows mild-to-moderate exercise intolerance.  

*Lung sounds may be increasd

*Radiography may show mild-to-moderate changes, e.g. right ventricular enlargement.  

*Anemia and proteinuria may be present.  

  |-

  |-

  |<center>'''Class 3'''</center>  

  |<center>'''Class 3'''</center>  

  |<center>Severe disease. Signs are variable but may include weight loss, exercise intolerance, tachypnoea, dyspnoea, severe/persistent coughing, hemoptysis, syncope, pr ascites. Radiographs appear abnormal: right ventricular hypertrophy, enlargement of the main pulmonary artery, and diffuse pulmonary densities. ECG often shows right ventricular hypertrophy. Aneamia, thrombocytopenia, and proteinuria are seen.</center>

  |'''Severe disease'''

*Signs are variable but may include weight loss, exercise intolerance, tachypnoea, dyspnoea, severe/persistent coughing, hemoptysis, syncope, or ascites.

*Radiographs appear abnormal: right ventricular hypertrophy, enlargement of the main pulmonary artery, and diffuse pulmonary densities. ECG often shows right ventricular hypertrophy.  

*Anaemia, thrombocytopenia, and proteinuria are seen.

  |-

  |-

  |<center>'''Class 4'''</center>  

  |<center>'''Class 4'''</center>  

  |<center>Caval syndrome: sudden onset of collapse, haemoglobinuria, and respiratory distress. Usually fatal without immediate surgery.</center>

  |'''Caval syndrome'''

*Sudden onset of collapse, haemoglobinuria, and respiratory distress.  

*Usually fatal without immediate surgery.

  |-

  |-

  |}

  |}