Golden VS Pom:how can you tell a power struggle from normal game-playing?

Sometimes I am really confused, wondering if I should interfere or not while seeing my Pom snapping at the legs of my golden to start a “war”. Oftentimes, the Pom rushes to the face of golden, then rushes away, turning around to see if the golden is pissed off to run after him. I find it an amazing entertainment that the Pom hides underneath the sofa or bed, and the golden stick his big head to where the Pom is hiding, growling and biting each other’s head, lips, paws, etc. What do you think of that? Is it just a normal game with no one being injured?
I know it’s a show of dominance when the golden put its paws on the back of or humps on the Pom, and I would tell the golden “No” and stop that behavior right away.
But should I do the same to the Pom when he does something on purpose to agitate a “fighting” like I describe above? How can you tell a power struggle from normal game-playing between dogs?
Thanks you all!
Answers:
Unless one of your dogs is in danger of being injured, it's really best to stay out of the power struggle between your dogs. If you interfere, giving a bit of support to the dog that was beginning to take the subordinate role, you will unintentionally cause more scuffles as the dominant dog is forced to remind the subordinate dog of where he should place himself in the heirarchy. If you continue to interfere, what has up until now been playful, but meaninful behaviour that is not risking the health of either animal, could escalate into all out fighting, due to confusion caused by you.
Just let them figure it out. Don't forget that our sense of "justice" doesnt' apply to dogs, so what may seem unfair behaviour to you, is quite meaningful %26 important to your dogs. Once they seem to have established who the boss is between them, it's important for you to support their decision, by slightly favouring the dominant dog by feeding him first, for example, or by petting him first etc. Again, this may seem unfair, but it will reinforce the heirarchy chosen by your dogs, and will help keep the peace. Dogs feel more secure %26 balanced when they know where they fit in the heirarchy, and just because a dog is seen to be the subordinate, doesn't mean he's unhappy about it!
And yes, growling %26 biting at each other's mouths etc is quite normal and is friendly play, and doesn't indicate hostility. It may still have underlying reasons that only the dogs know about, but dogs rough-house. It's natural %26 healthy for them.
It sounds to me like your dogs actually get along very well, and are quite happy to be friends.