Thanks for the responses everyone.
Batmom: She's not usually very cooperative, so I don't think doing it while she's awake would be an option. And I'll ask the vet about a board certified anesthesiologist. There IS one in Charleston.
tbhounds: The LVT I spoke with said they didn't use preops because of how sensitive greyhounds can be. I'll ask again when I talk to the vet (she was off when I called).
I checked Xena's adoption book yesterday when I got home. She went in with 4 or 5 others for her dental & spay. No notes. I'm guessing it's an in & out, wham-bam-thank