Doug panel with Billy West, Fred Newman, Connie Shulman, Becca Lish
and Jim Jinkins. Fred Newman and Dan Sawyer start it out by playing some of the music from the series a little after 1:17:
https://www.youtube.com/watch?v=tfrq7ZDy6co
My favorite part was getting to hear Billy West and Fred Newman interacting again as Doug and Porkchop. Billy's been doing that particular sample for his Doug voice for years as he toured doing interviews and panels, during which he's always had to do the dog bark himself, and that moment here where it hits him that he has the REAL Porkchop there with him to do it is epic.