Less than a month ago, my girl, Boba got her second tumor removal (mammary). Today, while playing with her my sister noticed a lump on her neck. It felt firm, like a rock, and movable. It's likely that it's not a mammary tumor because it's not in an area where mammary tumors are, but we don't know what it is. We can't take her in for another surgery because she most likely won't survive the anesthesia again. Does anyone have an idea of what this might be, and how fast it could grow?