We discovered a murmur on my Darque when she was coming on 7 years old. Not a bad one so no meds prescribed. She continued to run in and win open trials through 10 years old and continues to be healthy, happy, playful and still does some farm work for me, she will be 12 in May. So far I am not aware of any of her pups have being diagnosed with a murmur (3 litters ages 4, 6 & 8 years). Is it unusual to not have to medicate a performance dog or am I just lucky?