Breed-specific legislation, the body of law that restricts or bans particular animal types, is overwhelmingly aimed at dogs rather than cats. As a practical matter, owners of the Napoleon are very unlikely to encounter laws that target their cat because of its breed, and the breed is not subject to the kind of municipal bans sometimes applied to certain dog breeds.
Where regulation touches the Napoleon, it tends to operate through registry recognition and breeding standards rather than ownership bans. The International Cat Association recognizes the breed, while some other registries decline to register Munchkin-derived breeds over welfare concerns tied to the dwarfism trait. These are organizational policies rather than government laws, but they shape where and how the breed can be shown and registered.
A small number of jurisdictions around the world have debated or enacted broader animal-welfare rules concerning the deliberate breeding of animals for traits that may compromise health. Such measures are aimed at breeding practices generally rather than at the Napoleon by name, but they form part of the regulatory backdrop that responsible breeders watch. This page describes that landscape for information only and presents it without taking a position.