Bear seems to be doing well and recovering nicely from his surgery. I somehow missed the call from the vet last Thursday and his message until yesterday evening. The lesion was benign, but it was what the vet thought it was. Apparently, this type of thing is usually seen in dogs about 1-2 years old, rather than a 5-year-old dog. And it is usually caused by a virus so he won't get it again. Hopefully he didn't give it to Moo.
Bear should be fine so long as he doesn't lick himself raw around the incision. But that's about it.
Thanks for all the good thoughts and prayers.