My soon to be 13 year old GSP has a "lump" behind his front leg. It seems to be in his skin, not attached to the ribs. It is half the size of half a sofball or grapefruit. The vet says she can take a sample and look at it in the office, biopsy it and send it to a lab to see what it might be....or....we could just remove it, "if you don't like lookin at it". Really threw a selfish tone into it. It doesn't seem to bother him, I think her concern is his age and the anesthesia. Over the last, maybe 18 months, this has been growing and now feels pretty solid under the skin. I just think it will become an issue, sooner than later, if left. Any thoughts, or similar experences with "experienced" dogs?