Thank you all for the replies. The breeder has responded to me and says she will replace the puppy if we choose. She says she has never encountered this before with her past puppies. She states the studs are all genetic tested and that careful pedigrees are kept. But I believe that this condition would have been discovered then. Also, my vet even told me that if this puppy had been seen by a vet for her first set of shots that the PDA would have been detected. Now, the breeder says that her vet is old fashioned. She also plainly said that her vet would not be able to perform the surgery, due to him being old fashioned. And that she can not afford the surgery herself.
I'm so devastated. I feel like I have been scammed

. I can't bear the thought of just sending her back. You all know how sweet these babies can be and how quickly they can steal your heart. But I also know how much money I spent on her and how much this surgery could likely be.
With all this said, I'm still waiting to hear back from the vet on my options. I'm guessing she will want to do a confirmative diagnostic test for a start. Just keep little Harley in your prayers please