I told my son that I would pay ONCE for the surgery, because I wanted to demonstrate to him the responsibilities of pet ownership. But, I made it clear to him I could not afford it twice, and when, as the vet said they would, the tumors came back, we let her live as long as she could move around and had quality of life, then we took her to the vet to be euthanized. I realize, this is a RAT we are talking about, but it was more symbolic. And, they have personalities and actually very nice pets. Ours were darlings, but tumors shortened their normally 4 year lives to about 2.5 years.