I don't think it's common, per se - so a breeder should only notify you if she's discovered this in her lines (and, she should stop breeding those lines). SA can be very benign and can be tracked by the vet. SA often will not progress to anything further; but it can, and that's what your vet can keep an eye on. It can easily be tracked via the vet's stethoscope and if anything further is suspected, the vet can do an ECG.
__________________ ~ A friend told me I was delusional. I nearly fell off my unicorn. ~
°¨¨¨°ºOº°¨¨¨° Ann | Pfeiffer | Marcel Verdel Purcell | Wylie | Artie °¨¨¨°ºOº°¨¨¨° |