I went through that agony. The first lump, which on biopsy did prove to be cancerous. I paid the money and had it removed, but it had spread. I also paid for the second surgery, but then it reappeared in another location. Then I realised that my dog was undergoing surgery that would only prolong her life, would not save her. That is when I chose to have her PTS. She was 11 at the time, and had been very well loved, very well cared for. It was the only option for her.