Is he still having metacam? My piggy Arthur had a bladder stone removed at the beginning of July. He has since made a full recovery. His anaesthetic was gas and his pain medication was metacam so he recovered quickly from the anaesthetic and was eating as normal within a couple of days. I didn't need to give him critical care. He sometimes cried when he weed for a few days so I kept him on the oral metacam twice a day until that stopped happening. If Dougal had injectable anaesthetic and/or opioid pain relief that will have made a difference. Also the length of time the operation took affects the recovery time. Eating and pooping are great signs, even if not as normal, it is still early days.
@weepweeps I am so sorry about Percy, it doesn't seem fair.