I hope your not afraid because of the movie Cujo?! Saint Bernards, like most giant breeds, are known as Gentle giants, they are very gentle and kind, big softies actually. They make wonderful family pets. An untrained Saint can be dangerous , just because of his massive size, they can easily jump up and knock a grown man to the floor. Read up more on the breed, theres nothing to be afraid of, they are very sweet natured dogs.