After each victory, the Flyers chose someone to dawn the underdog mask, a symbol not only of the Flyers but a symbol of Philadelphia sports as it was first used by the Philadelphia Eagles during their 2018 Super Bowl run. After each victory, the player who was chosen to wear it the previous win, choses the dog of the night.
After Deslauriers is presented with the mask, he puts it on and lets out a good bark as the locker room goes crazy in celebration. Moments like this put into perspective how much fun the Flyers have winning and how close knit the locker room has become.