The veterinarian can usually diagnose a heart murmur during your dog's annual exam. In more severe cases, your dog may begin to exhibit symptoms of a murmur that prompt you to make an appointment. These symptoms include trouble breathing, loss of appetite, weight loss, pale gums, and lethargy. If the vet discovers a murmur, he or she may perform some tests to determine the location of the murmur and any underlying diseases or conditions. Tests include echocardiograms, electrocardiograms, and blood tests.
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