When does CatDog return?

The series follows the life of yellow conjoined brothers of different species. One half of the resultant animal is a cat and the other half is a dog. The series ended on May 7, 2005 after a total of four seasons and 66 aired episodes over seven years.
The series revolves around Cat and Dog, a conjoined twin of a cat and a dog, who share the same body with no tail or hind legs. The series takes place in Nearburg, a town dominated by anthropomorphic animals and the occasional humanoid.