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Although in the early stages of heart failure in dogs, they display no visible signs, yet heart failure can be diagnosed through a clinical evaluation by a vet. If your Boston Terrier pet experiences heart failure, his symptoms of this would be a heart enlargement, coughing, lethargy and difficulty in breathing. Severe heart failure is characterized by difficult breathing, even while at rest, fainting, profound intolerance to exercise, loss of appetite and weight loss.
Signs and symptoms. Dyspnea is the most common symptom, but it is very nonspecific. Patients may also complain of chest pain or discomfort, easy fatigability, cough, and orthopnea, or they may be completely asymptomatic. Signs include distant heart sounds, and pericardial friction rub. With cardiac tamponade, progressive heart failure occurs, with increased shortness of breath, cold sweats, confusion, hypotension, jugular venous distention, and pulsus paradoxus.