"A Dog's Journey" is a film that follows the life of a dog named Bailey as he reincarnates into different dogs over several decades. Each time he is reborn, he continues to search for his beloved owner, Ethan, and fulfill his purpose of bringing happiness to humans. Throughout his various lives, Bailey encounters new challenges and forms bonds with different people, including CJ, a young girl who becomes a significant part of his journey. The story explores themes of loyalty, love, and the unbreakable bond between dogs and their humans.