@Kerry Souter good question, I’m not massively familiar with the specific needs of pigs but will do a bit of research. But here’s what I would say, assuming pigs are happy on their own, then yes it’s very possible to do it ethically. Even then pigs are very intelligent so I imagine that even if they typically do better in numbers, with enoigh attention and care a pig would likely be quite happy. You would have to decide how you plan to keep a pig, would you have it free roaming around the house? Or would you have a specific place it lives. It would need outdoor space, better its own space as pigs tend to make a mess! (This makes them very good ground clearers) but not so good if you like a tidy garden. A pig hut, suitably sized enclosure and suitable feed would be a good start. It used to be quite a common thing that people would keep ‘pet’ pigs at the bottom of the garden, they would feed it all the scraps from meals, probably surplus food aswell, then when ready slaughter and eat. Another factor to consider is vet bills, farm animals can be costly. Pigs can also live for a very long time (up to 20 years) so that would play a big factor in it. After doing a bit of research, there are mixed reviews about pigs being alone. Whilst they can do well on their own. Pigs are generally quite sociable creatures so more than one would be a more ethical idea (obviously this increases all the other needs) Let me know if you have any other questions or I have missed something.