I tended to put mine back together (as they would get anxious apart) and watch them to make sure there were no issues. You obviously don't want the other pig to gnaw or otherwise interfere with the wound, but I never found that was an issue, apart from a bit of sniffing. My pigs settled better in their usual environment with their companion and I just kept a watchful eye to make sure there was no conflict and the sick pick was getting the time and space to recovery and was not being pestered by a cagemate. I found how tired/groggy they were really depended on the op and the painkillers given. My vet holds onto them for several hours afterwards to let the anesthesia wear off and ensure that they are back on their feet. When Sundae had dentals and Linney had a mass on her lower back removed, they were only slightly 'off' afterwards, but were up and moving and eating and behaving fairly normally by the time they came home. When Sundae had a very deep abscess lanced and drained, however, she had been given a stronger pain med and was much more groggy and spacey for a day or two after surgery. I think she was totally stoned, honestly! I would make sure you have the means to syringe-feed if needed and then see how he does when he comes home. He may be much like his usual self, or he may be very groggy and need more assistance. Best of luck on the operation today- keep us posted!