They’re beautiful , are strong , well- processed are dangerous nose to smell her offenders . Trains for hours , give exams receiving scores do not take bribes and do not betray their partner never. Are correct , religiously listens orders are never suspected of corruption and , in time, become its most loyal friends. From the age of three months and up to 8-9 years , when they reach retirement age , the dog must go through pre- training , training , operational work and annual checks . The exam is applied to each quadruped in part , depending on the specialization has been trained dog. Processing a trace , scattering a group of demonstrators, crawling to catch criminals , all dogs are among the exercises examined.