Dogs that are trained professionally as attack dogs, guard dogs, and patrol dogs, are trained to see through a person's disguise. In other words, a burglar who puts up an aura of fearlessness and confidence, thinking that he can dazzle a trained guard dog into believing the burglar is “Mr. Nice Guy” will be in for a surprise! For a well-trained dog, all the sweetness, fearlessness, and confidence in the world won’t win past his professionally trained senses.