In my opinion, there are no such things. I was one of those people who thought, of course there are mini pigs, people own them. My girlfriend and I did as much research as possible on breeders until we found Pixie Pigs, an online breeder. We also read through the bi-laws of our city's ordinance, which allows pigs up to a certain weight. When buying our pixie, we were told his parents were 18 lbs and 22 lbs, both fully grown. At 6 months old, our pig reached 39 lbs. Pigs don't stop growing for the first 4 years of life, so he was clearly not a miniature pig and would far exceed the weight this breeder estimated at 20 lbs. It was heartbreaking that he was now illegal to own and we started looking for adoption so we could find him a good home. We called the breeder to talk though this with her. She insisted that he was probably overfed and just bigger for that litter. Eventually she stopped picking up our calls and stopped replying to emails all together. We have had him walked 2x a day for exercise and fed him vegetables since he was young. His veterinarian has always said that he is a very healthy weight, he is just not going to be the weight we expected. The veterinarian estimated him to possible be 95 or more. I hope you don't have to go through an experience of adopting out a pet they can't care for.