With the training essential for ownership of a large working breed, adult Bernese are generally gentle, easy-going and tolerant. They do not do well when isolated from people or activity. This breed can be slow to mature, and young dogs can be very active compared to the trained, often mellow adult. While Bernese should not be shy, this tendency does run in the breed. Due to temperament concerns, it is very important to expose Bernese to a wide variety of people, places and other animals, especially in their first year of life. However, caution should be taken not to over-face a sensitive dog.