Even though the huge majority of dentals have no complications, we all understand here being frightened of having a beloved hound undergoing anesthesia.
Following is the "Anesthesia" section of "Greyhound Medical Idiosyncracies," by William Feeman, DVM, which he made available on GreyTalk. It sounds like you're already planning on several of the precautions he recommends, and it sounds like he doesn't think there's only One Right Way to perform a safe dental. Plus, remember that even though Mickey was younger when she was spayed, that was a more involved operation and evidently she came through fine. We have had good experiences with the vet using pre-medications before dentals -- less anesthesia needed, so less groggy afterward.