I've had several dogs in my life and can say I've never seen any of them do what this guy does. Hearing a dog bark on TV and barking back or watching a dog or cat on TV and reacting, "yes".
I did have a Beagle named Betty who did many funny things. Beagles are known for their antics, especially as it relates to food. When I would pour Betty's dry food from the bag into a plastic container, she would stand next to me, biting at the waterfall of food, and actually getting some to eat. One time I had a large loaf of French bread on the kitchen counter...I left the room and came back and it was gone! I was so confused until it occurred to me..."BETTY"! There she was, out the dog door, into the back yard, with the loaf in her mouth, chomping away. I swear as she chomped her body grew twice its size. But TV pizza-licking? Never.