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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.
Symptoms can include chest pain, dizziness, shortness of breath, or fainting. HCM also can affect the heart's mitral valve, causing blood to leak backward through the valve. Sometimes, the thickened heart muscle doesn't block blood flow out of the left ventricle.This is called non-obstructive hypertrophic cardiomyopathy.The entire ventricle may thicken, or the thickening may happen only at the bottom of the heart. The right ventricle also may be affected.CM is a common cause of sudden cardiac arrest (SCA) in young people, including young athletes. HCM occurs if heart muscle cells enlarge and cause the walls of the ventricles (usually the left ventricle) to thicken. Despite this thickening, the ventricle size often remains normal.