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Causes of Heart Murmurs in Dogs.

Heart Murmurs in dogs are caused by the following: Disturbed blood flow associated with high flow through normal or abnormal valves or with structures vibrating in the blood flow.

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In addition, because the heart is not pumping effectively, these dogs can develop profound weakness, lethargy, exercise intolerance and fainting. Unfortunately, they can also pass away suddenly from abnormal heart beats (arrhythmias) from the diseased heart chambers.

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