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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 doctor may recommend an EKG if you have signs or symptoms that suggest a heart problem. Examples of such signs and symptoms include: 1  Chest pain. 2  Heart pounding, racing, or fluttering, or the sense that your heart is beating unevenly. 3  Problems breathing. 4  Feeling tired and weak.