Thank you. I am sorry you lost your Beau to this horrible disease. Due to his age, I'm going the palliative route as well. Right now Manny's acting like his old self. The Lap of Love site has some very useful information.
I've come to grips, for the most part, with having to take finances into consideration in deciding the course of treatment to pursue. Now I'm trying to come to grips with how much this is costing and how on earth I will be able to pay for it all. I applied for and received CareCredit. I was hoping to be approved for at least $10,000, but the credit line is for $8,000. I'm sucking up my pride and setting up a GoFundMe page and pray I'm able to cover the costs of his treatment. I can't bear the thought of having to stop treatment because I simply can't afford to do any more.
My Beau had cancer. He was nine, still young for his breed and size. It was an aggressive and incurable cancer. We really had no treatment options other than palliative care. So that's what I did. It had come out of nowhere and the week after the diagnosis, I freed him. Different from your situation a little. All I can offer is that it is a personal decision and different for every owner and every pet. I freed Beau before the worst of the cancer took hold. Not all would have done this, some would have. I made my decision on who he was and what I thought he could tolerate and not tolerate physically and emotionally. So I took into consideration not only the physical changes I was seeing, but the emotional/mental changes. The vet visits he began to hate, the draining of the fluid from his abdomen left him out of it. So I decided to just provide palliative care, love him and care for him for what would be our last week and I decided to free him when I saw his frustration with trying to "live" with it. That is jut my personal experience. May not be right for you in your circumstance. It was hard, we are given a diagnosis and are in a way, asked to be a doctor with our decision making. We likely have no prior experience with this and it's a heavy weight to carry.
Although these tow sites deal with post loss, they also deal with pre loss. Lap of love had good information on quality of life. There is a short video on it as well as articles. Moira Anderson Allen has good articles on it and pre-loss too. http://www.lapoflove.com/http://www.pet-loss.net/
I'm sorry and I wish you and Manny the best with what you are dealing with right now. You will do what's best for him. We all do.