Pet dogs have come a long way from their ancestors, they are domesticated and do not hunt to eat nor are they about attacking in packs. Dog breeds of any breed are ideal home pets and family members, its strangers that should beware of unleashing the wolf in every pet dog.
An expert attack dog trainer  used working protection dog breeds such as the Bulldog, Mastiff, Malinois and the Dutch Shepherd to observe traces of its ancestor when commanded to attack. A Bulldog gets an assailant by the limb, hangs on and and twists its bite to inflict pain to get it down.  A Mastiff works more like a wrestler and uses its weight to get an assailant down, its bite force by the way recorded over 500 on a bite meter. The Malinois recorded a bite at 194 and used speed and coordination to bring the assailant down. Among the dogs, the Dutch Shepherd attacked on command using its weight, speed, coordination and bite force to bring attackers down-its bite measures 229 on the meter.
In the study, effectiveness in command attack was seen in the Dutch Shepherd, which is said to be just like ancient wolves would do to bring down much larger prey.
Attack on command and protection protocol using dogs takes careful study and exact training for both the safety of the pet dog and the family itself. Before having your pets trained to provide you protection, making sure you get the proper handler or trainer that would understand your pet dog's breed and capabilities and not just train it to attack on command. Vigilance has its price and getting the best trainer money can buy is well worth it.