Fang, assigned as Agent K-13, is the name of Maxwell Smart’s canine companion at CONTROL. Max and Fang were very close, having graduated from spy school at the same time. Their skill sets were similar, as Max poorly trained Fang. Agent K-13 sometimes used the undercover name, Morris. Fang was written out of the script after season 2 because Red, the dog who played Agent K-13, was reported to be poorly trained as well. Episode shooting schedules often had to be extended during all scenes with the dog, increasing production costs. Fang was officially transferred to a desk job at CONTROL, in charge of burying evidence.