He had a "low grade" form of cancer, but the lab verified that our vet removed every bit of the large tumor. The other [smaller] tumor was just fatty skin, so this is very good news.
His stitches are healing over really well - he gets them removed next Wednesday. He'll have to be sedated again, but only mildly, so I'm not worried about that at all.
Overall, he's just really pulling through. We'll have to be vigilent for the rest of his life when it comes to discovering any new skin tags on him, but he won't need chemo or any toxic meds. Pretty much, he's good as new now. Clean slate, all is well!
*WHEW*