My 4 yr old Boxer has had swelling in his leg for the past four months and I have taken him to numerous vet's and they all have put him on steriods and antibotics since they couldnt find anything in the x-rays. Well after racking up nearly a grand in medical bills I took him to a clinic that specializes in dog diseases and is suppuse to be the best around, well they called me this morning and saidthe dog has a tumor in his leg and has a mass of possible cancer in his lungs. Basically, he has anywhere from 6 weeks to 3 months to live without chemo, and even with chemo the success rate is less than 10%! At this point what is the best thing to do for the dog, I dont know if I should put him down immediatly so that he doesnt suffer, should I keep him for a while to see if it gets worse or should i have the chemo done?