6 year old yellow male Labrador woke up one morning with a lump on lower hind leg. Vet said that the aspiration from pathology showed spindle cell sarcoma or trauma to that area. They were unsure which one it was. About the size of a big marble. Does not bother him at all though. He doesn't even know it is there. Not sure if I should wait and see or remove it. Surgery would be a big scar of at least 10 stitches. Anyone have this before.