"At the top end of the urban livestock scale are pigs. Now it is theoretically possible to keep pigs in fairly small gardens, but it won't be nice either for you or the pigs. They need plenty of space... So for most of us, urban pig-keeping is not practical. Plus there is quite a lot of paperwork involved - medical and movement records, and your site may need to be assessed before you are given the appropriate permissions." For more on urban gardening, urban livestock, and how they affect relationships within the stereotypical anglo nuclear family, see this article from the Guardian.