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Which dog breed is more likely to be born with a heart murmur: Lab, Pit Bull, or Boxer? - what is a heart murmur more condition_symptoms

Without puppy dog babies born prematurely, was the offspring of undernourished mothers, mothers who have complicated pregnancies, etc.

To say that these puppies a great line, large documents, top breeders, etc., have, the race is more likely to have a heart murmur?