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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.
When to see a doctor. Arrhythmias may cause you to feel premature or extra heartbeats, or you may feel that your heart is racing or beating too slowly. Other signs and symptoms may be related to your heart not pumping effectively due to the fast or slow heartbeat. These include shortness of breath, weakness, dizziness, lightheadedness, fainting or near fainting, and chest pain or discomfort.