Chronic, coughing, exercise intolerance, dyspnoea and tachypnoea in young dogs is due to blood vessels being blocked by adults, eggs and larvae.
2.
Intolerance to exercise may be caused by unusual breathlessness ( dyspnea ), muscle pain ( myalgia ), tachypnoea ( abnormally rapid breathing ), tachycardia ( having a faster heart rate than normal ) or increasing muscle weakness; or exercise might result in severe headache, nausea, dizziness, occasional muscle cramps or extreme fatigue, which would make it intolerable.
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