My Bichon has had a heart murmur for years and it doens't hold him back at all. His is a low grade heart murmur. I do pay close attention to his breathing and panting. If he ever shows signs of increased panting or if his breathing patterns change we make a trip the vet as these could be sings that the murmur is getting worse. So far nothing. He is 12 years old and still quite active.
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