At first look it is intimidating. After you realize, during training the dog is always on a leash with an expert handler in control. The dog and the handler know each other very well, revealing this situation not quite as scary as it first appears.
As an agitator wearing a padded suit and working the dog to develop its skills is actually great fun. Like a stuntman dog trainer. :)
Expertly trained dogs that descriminate and can descern an actual threat, be in high alert, off leash, and only attack when prompted bring high dollar as personal protection dogs.