My dog is very submissive most of the time but once in a while shows signs of dominance. Why is this?
Believe it or not, most dogs don't want to be alpha. There are some that were born to be leaders but most will hand the position back to the owners in a heartbeat if they feel secure with the owners being strong-minded enough to handle it. Dogs can flip back and forth between taking the role over and giving it back, especially those who do not really want it. Those dogs that do not have to flip-flop because they are confident their humans can handle the role are much, much happier.