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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.
Your heart may beat too quickly, too slowly or irregularly. Heart arrhythmia symptoms can include: 1  Fluttering in your chest. 2  Racing heartbeat (tachycardia). 3  Slow heartbeat (bradycardia). 4  Chest pain or discomfort. 5  Shortness of breath. 6  Lightheadedness. 7  Dizziness.