Leg surgery for Shana

Hi my name is Shelia Davis and my dog has a mass under her left arm. It has caused her great pain and I have almost spent all of my savings helping her recover. She is unable to rest or lower her arm and hops around on three legs. Before this condition, she was a very active dog so it hurts me to see her like this. I would appreciate any help or donations I can receive. Please help. Thank you!