Charlie is 20 weeks now. We had a check up 5 weeks ago when we first brought him home and the vet thought she heard a slight murmur but listened longer and ruled it out. Today he had another check up and the vet took a listen and is certain he may have a murmur. No idea what this means for him. The vet said that we would take another listen at the one year mark. Has anyone had this experience? Outcome?