Max the Dog is a fictional character from the animated movie series The Secret Life of Pets. He is a small, white, fluffy dog known for his playful and loyal personality. Max lives in a cozy apartment in New York City with his owner, Katie, and enjoys spending time with his pet friends. In the movies, Max often finds himself in various adventures, especially when his owner is away. He is protective of his friends and shows bravery when facing challenges. Max's character highlights themes of friendship, loyalty, and the bond between pets and their owners.