I actually also know of someone who does live in the city and has a pet pig! She walks her pig on a leash and she(meaning the pig in this case) is about the size of a dog but a lot wider/heavier than the average dog. I don't know the owner personally so have no idea if the pig is difficult to take care of but they seem like a happy pair when I see them walk outside. When people get a pet piglet they definitely shouldn't underestimate taking care of the pig when it grows up though that's for sure.