The dog breeds that Bailey is in each life are an elderly St. Bernard/Australian Shepherd, a female beagle named Molly, a male English Mastiff named Big Dog, and a Yorkshire Terrier named Max.
One part of the movie features Max and Duke, two dogs who live in an apartment in New York. Max and Duke were the names of the two dogs in Secret Life Of Pets movies who lived together.
On May 11, 2019, Marg Helgenberger's predecessor in the role of older Hannah, Peggy Lipton, passed away due to cancer five days before the movie premiere.
In A Dog's Purpose, Dennis Quaid wore brown contact lenses as Ethan. He did not wear contacts and showed his natural blue eyes in this sequel.
Was filmed using the title "Molly and Max".