If I had the money, and my pet would not suffer by prolonging its life, I guess the answer would be yes.

my american friend is prolonging his dog's life by giving her chemotherapy, is that wrong? I don't believe so, she would only have had 4 to 6 weeks left otherwise, this way she may go into remission and live a year or so, who knows, he would never let her suffer through the therapy, and would end the sessions if he saw that happening.

Each situation is different, and I personally cannot judge anyone on their decision until I have walked in their shoes.