Dusty had a heart murmer that was diagnosed in 1997 at 7 years of age, at that time the vet felt that she may have been born with the condition. Dusty required no meds for it, or had any health problems because of it until 2006 at almost 16 years of age. I had her for 12 years and of those 12 only the last year did her murmer cause any type of problems for her.
On a side note I have an uncle in his late 60's who has had a heart murmer since birth. He takes no meds for it, and is a very active person, including many sports when he was a bit younger.
I hope your vet does whatever tests are necessary and finds that your Specs heart murmer is one of those that are not serious or require meds for.
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