I do not interfere in interactions beween adult dogs and puppies unless there appears to be imminent danger of physical harm to an individual. Adult dogs will make incredibly threatening noises and gestures towards annoying puppies but rarely will they injure them. These interaction are educational and important to puppies. MOst adults will tolerate almost anything from a puppy until they are near 4 mos of age, at which time what we call the "puppy passport" comes to an end. At this age, puppies are expected to demonstrate respect and to begin to interact with adult dogs on a normal basis. You sometimes see a lot of growling, body slamming, muzzle grabbing with growling, etc, by adults as they impress on these imupdent puppies exactly where their place is in the hierarchy. Again, I do not interfere unless injury is happening.
JMO as always....