Update over the weekend:
1. On Wednesday, Pigsilver went in to get his teeth filed down. The vet called me that afternoon and she said things went well, they're going to monitor him.
2. On Thursday afternoon, we picked him up from the vet. He looked to be out of it, but since this wasn't the first time I had a guinea pig go into sedation, I wasn't too worried. The vet said expect him to take a day or two to get going again. Until then, she gave us a few meds (Metacam, Proposid, and some eye drops) to keep him comfortable.
3. Friday and Saturday, his condition didn't quite improve as much as we expected. There were a few signs of hope; there was one time he actually bit off the stalk of a piece of dill and ate it. He also took on a carrot. But I still haven't seen him eat any hay. We've been keeping him on about 60-80cc of Critical Care a day. He's gotten feistier around the feedings compared to Thursday, so I think for the most part he's okay. His beard is no longer wet, so I guess drool isn't an issue. I frequently see him lying in the hay, but again, I don't know if he's eating it.
Today, much the same. He will occasionally munch on some veggies or eat a grape tomato, but we still haven't yet seen him eat hay. I try to wave seed heads in front of him but he's not having it. He's dropped about 1.5 ounces since Thursday which may have been because we've scaled back the Critical Care to encourage him to eat again. When I peer into the cage I can sometimes see him chewing on something; that's a little encouraging...his stools still look a mix between extremely mushy and dry instead of the jumbo sausage shapes they usually are.
I have a follow-up with the vet tomorrow, but she said if things don't improve within 7-10 days post-surgery, it might be time to explore "other options".