Max and Gidget will be return in The Secret Life of Pets 3 as the main characters.
The Secret Life of Pets 3 will be tentative title calls "The Secret Life of Pets: Rescue in Paris", "The Secret Life of Pets: Missing Gidget" and "The Secret Life of Pets: It's a Trap in Paris!".
The Secret Life Of Pets 3 will focus on a DIFFERENT set of pets, with Max and Duke being extremely minor characters.
Hey, they did it with the third Cats and Dogs movie.