CatDog is an American animated television series created for Nickelodeon by Peter Hannan. The series depicts the life of conjoined brothers, with one half being a cat and the other a dog. Nickelodeon produced the series from Burbank, California. The first episode aired on April 4, 1998, before the show officially premiered in October. The episode “Fetch” was also shown in theaters with The Rugrats Movie.