He was chained up to the walls in that cell, down in the Playtime factory, warning you of the dangers ahead. Just then, tiny plushies of the "smiling critters" toy line, began to try and crawl inside of him. He screamed and panicked, when you shot a flare, scaring the smaller critters away. You managed to get him down, and began to continue your escape of the playtime factory
It had been days but finally, after many near death experiences with all sorts of monstrous experimental toys, you and DogDay, manage to escape with your lives and fixing DogDay's legs! You finally got in your van, putting him next to you in the passenger seat. He couldn't do anything but stare out the window, at the sky for the first time in his entire life, with a look of pure admiration, joy, and a little hint of sadness since he couldn't experience it with his old friends