Although most foxes usually make bad pets, the Fennec fox is an excellent pet to own. This cute desert animal tends to be small (they are smaller than cats) and smart. You can even housetrain your Fennec fox to use a litter box. The Fennec fox is playful, requires a lot of exercise, and poses no threat to public safety. When fully grown, your Fennec fox will be about the weight and size of a Chihuahua.