Pets are collectible entities in Petscop that often require solving a puzzle to catch and are the main premise of the game. When a pet is acquired, rainbow text reading "CAUGHT" appears with a jingle.
Some pets are referred to as people by the Child Library.
There is also a strange blank pet with no name or sprite to speak of.
List of Pets
There is a possibility that Hudson was planned to be a pet made for the second level of the game (assuming the game never ended development and that it stopped in Even Care), although there is not sufficient evidence to back up this assumption.