Homer unwittingly drags the family into a cornfield maze after attempting to leave a boring Harvest fest that Marge brought them to. When everyone except Homer escapes, Santa's Little Helper rescues him and becomes the town hero. So the family enrolls him in the Police Dog Academy and after graduation he's teamed with Lou. Police life becomes too much for Santa's Little Helper and he bites Bart. It is decided that he can no longer live with the family. Bart finds a new pet in a python, but in the end, Bart must choose between his dog and his snake.