I honestly don't know what I would do but if she's made it this long playing with the other dog, isn't everything the same as before you knew, with no greater risk now? Unless she's destabilized it or had an injury I missed in the posts you've made, I think I'd be tempted to let her live as she has lived until you found out there was a problem. If that surgery could further put her at risk due to the coexisting condition, it seems a bit of an excessive risk to subject her to in an already risky procedure. But of course only you know what you are going to be able to live with and deal with most effectively and you know your dogs and how they can best live their best lives. There doesn't seem to be one single right answer to the problem.
__________________  Jeanie and Tibbe One must do the best one can. You may get some marks for a very imperfect answer: you will certainly get none for leaving the question alone. C. S. Lewis |