We are waiting to pick up our new boxer puppy ( female ) in a week and the breeder called to tell us the puppy has a level three heart murmur. I have had two boxers, neither had heart issues ( which I know can be an issue ). I have consulted two doctors with differing opinions. We have asked the breeder to take the puppy to the vet one more time to check on the heart. The breeder has given us options...any suggestions? Do they outgrow this? We lost our last boxer at age 4 ~ which was hard for all of us, especially my three young children. thanks!