Hi Deb B-
I’m in total agreement with Red! If your dog can tolerate it, (being that she is 12), and your vet is suggesting it, I would consider surgery as well. My furry niece had a lump that kept getting bigger and bigger, then finally interfered with one of her internal organs and became inoperable. She ended up having to be put down as she could not longer eat.
Please do not blame yourself. There is no way to know what caused the lump. Sometimes it just happens, just like in humans. Best of luck to you and whatever you and your vet decide is best for your gal.
