
I would like to know, so yes I think you should call the breeder back and let them know.
Sorry to hear that :( I have a pup that was born with one and he has out grown it. I even had one in my very last litter and last I heard the puppy out grew it too, but he was aware of the heart murmer before he bought him. We were actually going to hold onto him till we knew what was up, but he really wanted him and he kept the appt I had booked for 4 weeks later and still goes to my vet.