I made an appointment today for x-rays of his chest which seems to be enlarging. Last night the pendulum went crazy over his lungs, forehead, feet (which are enlarged) and a growth on his front leg. (Read this: Occasionally dogs with lung cancer are lame. 1 out of 4 dogs show some kind of limp and the same numbers have no symptoms. The chest could also be enlarged due to the lymph nodes getting larger.)