It depends on the severity of the heart murmur
. It is not uncommon for a puppy to have a minor heart murmur and grow out of it. They will often show no symptoms. If it is more severe, there are heart medications for dogs. A dog with a heart condition has most of the same signs that people have: low energy, cough
, out of breath fast. Ask your vet how severe your puppy's murmur is.