"Adaption is like sitting down and deciding which of your fingers to cut off. It's all about what to throw out, because if you try to take all of A Dog's Purpose and cram it into a movie, you're going to have a five-hour movie. There is so much story that has to go, so much character detail. It's like tossing ballast out of a hot air balloon-for it to fly, you have to dump stuff."