I hope it's OK to post here after so long; I wanted to give an update on Arturo. Things have been hectic at home and work, so I flaked about keeping up on things here.
Arturo lost another 2 ounces, so we went back to the vet. He had x-rays and blood work. Here's what we know. His kidney and liver function is normal. His hematocrit and white blood cells are normal, so they don't believe an infection is present. There are no abnormalities (on x-ray) of heart or lungs, and his guts are not blocked/full of gas. The vet tried to examine his teeth more thoroughly, but wasn't able and says anesthesia would be necessary to go further with that. He does have one (possibly two) bladder stone, but the vet didn't think that would account for the decreased eating. We were sent home with critical care.
Arturo has never actually stopped eating, but he eats slowly, and the other 2 pigs still eat like it's never coming back. We've been separating Arturo mid-day to provide him his own extra meal. He takes quite a while (an hour or two), but he does eventually eat it. We have cut out the higher calcium veggies for now. He has not lost any more weight, and actually gained a tiny bit last weigh in (fraction of an ounce, maybe insignificant). His personality, playfulness, and interaction with the other boys remains the same.
I am guardedly hopeful, but don't know what to make of all this. I'd like to get his weight back up, especially if anesthesia will be necessary. I hated putting him through all that stress. He cried so loudly in the vet's office that I felt like a total jerk. The vet said the bladder stone might need to be removed surgically. I would love some feedback from others who have been through that.