Wow, it sounds like a mitral valve replacement and more. That’s pretty aggressive for a dog…but you know your dog. Will the surgery and recovery period be stressful? Will the surgery extend his life by a couple of years? Did the vets tell you that the surgery alone could be too much for him?
I understand however your desperation to help him, I lost a dog a few years ago due to hemangiosarcoma, no treatment options were offered.
Maybe you can find some helpful information here http://skeptvet.com/Blog/
Science-based Veterinary Medicine.
Best of luck with your decisions to do what is best for your dog.
