[K9-Lovers]

So funny.

AJBrown, to answer your question, the video trick wasn't with the dog moving his mouth, the trick was the "voice over" of the fake conversation.

The dog was responding to someone who was talking to him...probably saying something like, "do you want to go for a walk?" or "do you want a treat?".
The dog was moving his mouth and responding with grunts or little woofs and yawns (dogs yawn when frustrated or to cover embarassment).

Then to make the video, they blocked out ALL the sound, and then recorded two people, one for the guy talking and another person sounding as if he were the dog talking.

Meanwhile, the dog is still wondering "where is my treat and when the H311 are we going for that walk?"