How much is too much $$$?

[Geezer]

Some of you may remember a year ago when I told my story about adopting an abused English Golden Retriever named Rosie (Her picture is my avatar) who had been used for breeding in a puppy mill operation. Here is a rather sad update...

Rosie has just had a large lump removed from one of her mammary glands which was biopsied and found to harbour a nasty carcinoma. The vet gives her 10 months to live without further treatment. I took her the next day to the Guelph Veterinary College hospital where she was further examined and the prognosis was confirmed. They suggested that I submit Rosie to further extensive and invasive surgery that would remove a massive amount of tissue in her chest and abdomen and follow-up treatments, but the prognosis for her recovering would not really change all that much with or without the extra surgery unless we were very lucky.

OK, so far I have spent about $1,700 between my vet and OVC (Guelph). Further surgery would take another $2,500 plus the cost of the treatments.

I should mention that I am a 75 year old guy on fixed income that is rapidly shrinking due to the recession, so I am really in a quandary. I realize that when I adopted Rosie, I took on a commitment to her and I would cover all costs if I could (I may yet visit my bank to see if something could be worked out).

But what I am wondering is, How much is too much to spend on a 7 year old dog to keep her alive and relatively comfortable?

What would you guys do?