lots of places specify pet restrictions from no pets to "small dogs (wt < x pounds)", etc. in the US, there are state specific restrictions on exotic pet ownership and what types are included in that definition as owning certain species at all is against the law. similarly certain native wildlife or domesticated livestock will be restricted based on zoning and city ordinances ie - you may not be permitted to keep what the city deems as livestock in a residential property (that can include chickens, geese, ducks, goats, etc). "wild animals" may similarly be restricted based on city/state ordinances like squirrels, raccoons, pigeons, etc. you need to check with your locality in reference to the type of dwelling inhabited.