Awhh, when my dogs do that, I make sure to gently wake them up to let them know that everything is okay and nothing bad will happen to them. They do the same for me, actually.
I always wonder if they understand what happened when they wake up. Do they have any understanding of dreaming or do they just think they're suddenly somewhere else?
If you make bird sounds really quietly near them they really get going and will wake each other up with barking.
Yeah, he's barking in his dream. Our old dog used to do that, and kinda run too... funny stuff.
I bet he had a dream that he chased a squirrel up a tree.
...and now he can't get down.