In my opinion it is life threatening because at some point the pain will leave them with the decision to PTS. So I would tell the breeder what happened & ask her what she thinks is fair. A nicely worked email will give her alittle time to think & hopefully she will refund some. If she refuses to do anything I would make a report to AKC reporting those parents to have genetic health issues that are being passed to pups & let them investigate it. Hopefully she will attempt to make it right w/you w/o getting nasty about it. I am so sorry you & your little guy have to go thru this.