I am so sorry you are going through such a difficult situation with your Berner puppy. It is so sad when such young dogs have such problems. I am also sorry that you are not getting any support from your breeder. Are they a member of the BMDCC? Club members are required to uphold the contract they have with their puppy buyers. Sorry, I'm just trying to think of some way to help. Best of luck to you and your pup.