Changes

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  |<center>'''Class 1'''</center>   

  |<center>'''Class 1'''</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>

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  |<center>'''Class 2'''</center>  

  |<center>'''Class 2'''</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 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>

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  |<center>'''Class 3'''</center>  

  |<center>'''Class 3'''</center>  

  |severe disease variably characterized by anemia, weight loss, exercise intolerance, tachypnea at rest, severe or persistent coughing, dyspnea, hemoptysis, syncope, and ascites. Severely abnormal radiographs may show right ventricular hypertrophy, enlargement of the main pulmonary artery, and diffuse pulmonary densities. Laboratory results indicate marked anemia, thrombocytopenia, and proteinuria. Electrocardiographic evidence of right ventricular hypertrophy is often present.

  |<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>

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  |<center>'''Class 4'''</center>  

  |<center>'''Class 4'''</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.</center>

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  |}

  |}