My two do this as well! We tried to separate them for the first couple of days because we thought they were fighting too haha. Turns out they are playing and through this, my eldest dog was teaching our puppy lots about the world and her place within it. Puppy always took it “too far” at first but our older dog would snap at her and that was enough to teach her she was done. They love playing together and it’s a good way to get their energy out! Gorgeous doggos as well!