That's cute! And perfectly normal. Actually, what I do with young puppies is while they are resting or relaxed, I cover my teeth with my lips and gently "bite" the puppy's neck. This mimicks an older dog displaying dominance and helps keep a pup aware of her place.
"Crate and rotate" is a method used by some people who have dog aggressive dogs or who have dogs who don't like each other yet. Essentially, it means one dog is in a crate for an hour or so, while the other dog is outside of the crate enjoying free time. Then after an hour (or however long), the dog in the crate is released and the other dog goes in the crate. This reduces risk of contact between the dogs, but it allows the dogs to get used to each other's scent and presence. Furthermore, it helps a dog realize that he does not "own" anything. This practice is best for people who are fostering an unruly dog or who expect their two dogs to eventually learn to like each other. I do not recommend this as a long term solution for dog aggression. Some people also use this method if they have a female in heat and an intact male but do not wish them to breed.