A pet shelter providing a naturalized habitat for exploiting the instinctual behavior of animals such as dogs, cats and rabbits is disclosed. The pet shelter includes a structure having exterior and interior features of a gastropod shell. The features include an opening defining an entryway configured to receive an animal, a spiral-shaped corridor traversing an interior space of the structure, and a den within the interior space of the structure providing a resting area for an animal. The pet shelter also provides a user the ability to control interior airflow and lighting, and manage pet house training and whelping.