Discipline should not turn into a set of prohibitions that limit the freedom of the pet: nevertheless, for normal development, the puppy needs to be in contact with things and other animals as often as possible. Those who see a future watchman in their bern should develop the dog’s ability to divide people into friends and foes. This also includes such a skill as refusing to accept treats from the hands of a stranger. Exceptions are unacceptable even for “good friends”.