05/03/2020
Here is a video showing how puppies in a pack discipline each other.
The second video is Lily playing with one of her brothers. Her brother started being dominating to the point that Lily finds it "rude" and isn't enjoying the game anymore. You'll see her disengage from her brother and walk off from him. Puppies learn boundaries in playing when one of their littermates "shuns" them when the playing gets too rough. (Puppies don't like being "shunned"). If your puppy is playing in a manner that is obnoxious, try this technique by turning away from them and "shunning" them. Completely ignore them and then reengage in the game and repeat if the obnoxious behavior continues. Again, puppies at 8 weeks have learned the word "no".
The Sire of the litter, Yaeger, plays with his puppies some but he also gets grouchy with them on occasion. If they cross boundaries with him, such as interrupting him when he's busy with a chewy, he will give them a gruff low bark or gently snap at them. The puppies respond by looking contrite an walking back from him. This teaches the puppies respect in the pack. While a human yelling at a puppy at a young age will be detrimental and make them afraid, (a firm "no" or the techniques above are more effective and better for puppy development) if you have an older dog who snaps at or fusses at your puppy, do not intervene or scold your older dog unless you fear that they will try to hurt the puppy or if the older dog's scolding of the puppy goes on for more than a few seconds. Otherwise it is appropriate for an older dog in the "pack" to signal to a puppy if they are crossing boundaries.