Some have different intensity, location and time. What is the Grading Scale for Heart Murmurs in Dogs? It is important to know that a heart murmur is not a name for a disease, but a name for what we hear – and heart murmurs can be caused by many different conditions. When there is any turbulence of blood flow, the lub-dub is replaced by a swoosh noise – swoosh-dub, swoosh-swoosh, etc. This sound is made from the normal opening and closing of the heart valves (explained further later on). When your vet is listening to your dog’s heart through a stethoscope, they can hear the rhythmical lub-dub. Heart murmurs affect around 60% of dogs over the age of 5 years old. It is scary when your dog has been diagnosed with a heart murmur.
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