Russian biologists and scientists have studied the local dog population since the 18th century. After the Communist revolution, the Soviet government focused on working dog breeds for the Red Army, and imported the best breed representatives to Russia as per military dogs' and guard dogs' requirements. Over the decades, this practice harmed the local population. The introduction of new breeds to the region led to crossbreeding. Eventually, purebred dogs only remained with herders, breed enthusiasts and farms, with a surfeit of crosses elsewhere. However, the Central Asian Shepherd Dog population is still stable in general, reproducing some true quality dogs praised for working abilities, regardless of country of origin. Trading bloodlines and purchasing unrelated breeding stock between Russia, other "former USSR republics" (such as Ukraine, Belarus etc. ) and countries where CAO (Central Asian Ovtcharka) still at aboriginal stage is a common practice nowadays.