There are a number of pets that are illegal in the United Kingdom. These include dangerous dogs, certain reptiles, and certain wild animals.
Dangerous dogs are those that are bred for fighting or that have been trained to be aggressive. These include pit bulls, Staffordshire bull terriers, and American bull dogs. It is illegal to own, sell, or give away these dogs.
Certain reptiles are also illegal in the UK. These include alligators, crocodiles, and certain snakes. These animals are considered to be a danger to the public and are not allowed to be kept as pets.

Certain wild animals are also illegal to own as pets in the UK. These include lions, tigers, and bears. These animals are not considered to be safe for the public and are not allowed to be kept as pets.