Oh my, what awful news. Poor Kirk, I hope that he will be able to be helped with surgery. I'm sorry to hear that your co-workers are treating you badly. You can't expect a 5 month old pup of any breed to be perfectly behaved, let alone a high energy dog in pain!! Don't listen to them, I know you are a great dog owner and Kirk will turn out to be a very good boy, it just takes time. I definitely think you need to contact the breeder and that she should also contact the other pup's owners. I don't have any advice what to say really as I'm not so great at talking to people. Good luck!