Good Boy! follows the story of Hubble, the intergalactic dog pilot from Sirius, who lands on Earth with his team of talking dogs to investigate why dogs have not taken over the planet as rumored. Upon landing, Hubble discovers that dogs on Earth are not the same as dogs from Sirius as they do not have the ability to talk and control humans.
Feeling confused and lost, Hubble seeks help from a young 12-year-old boy named Owen, who becomes his owner and best friend. Owen is the only one who can understand Hubble's language, and together they embark on a mission to help Hubble find out why dogs on Earth have not taken over while teaching humans to love and appreciate their furry friends.
As Hubble begins to understand the human-dog bond, he discovers a sinister plot by an evil dog named The Greater Dane, who is attempting to turn all dogs against humans and take over the planet. Hubble and Owen, with the help of their canine friends, take on The Greater Dane and save the world from canine domination.
Throughout the movie, Hubble learns the importance of loyalty, friendship, and the bond between humans and their furry best friends. Good Boy! is a heartwarming tale of doggy heroism and the unlikely friendship between a boy and an alien dog from another planet.