The thing with dogs and cancer, you rarely do chemo to cure them. They can go into remission, but you do it to bring longer quality of life. I had a friend with a pitbull with lymphoma who had a huge mass (lymphnode) in her chest live 2 more great years with treatment. But on the flip side, I know a beagle with lymphoma that after 2 treatments they had to euthanasia her, she showed no response to the chemo at all. As far as cost, that really depends on where you live and what drugs they use. Doxyrubricine treatment can be $300 a treatments, and treatments are every 3 weeks. Lomustine can by $100ish dollars every 3 weeks. Then you have to think, at 14, if he was healthy, how much long would you have with him? Maybe another year? Anything can happen at this age. Unfortunately this is a personal decision and really doesn't have a wrong answer. You have to do what you feel is best for him and what you can live with whether it be chemo, palliative therapy or euthanasia. It isn't easy but you will make the right choice. Whatever you do don't second guess your decision or you will drive yourself crazy. I'll be thinking about you.