The dog defense service is mainly used by security personnel to cooperate with guard dogs and search dogs to protect important targets such as building courtyards, large warehouses, factories, mines, and outdoor sites, key gates such as airports and stations, and large-scale events such as exhibitions, performances, and events. Defense and risk investigation. Guard dogs can perform tasks such as guarding, patrolling, and escorting for key protection areas, places where difficulty is prevented, and single targets. Searching dogs to identify dangerous objects by smell is one of the most effective methods for on-site search.