Example of dominance in German Shepherd Puppies

Zaria the one year old German Shepherd pup shows dominance to her 9 week old sister Kefa. She has the stick but then drops it where Kefa can easily get to it, however as Kefa hesitantly approaches, she barely allows her to have it, then snarls and takes it away in a display of teaching the younger pup that she is the one in the position of dominance.
Kefa complains good naturedly but knows better than to try and have the stick again.
This is typical behaviour in puppies, and although they do play well together, there are certain things, such as her stick over which Zaria becomes possessive.