Scientific studies document the CAO breed to possess much genetic diversity, in fact more so than most breeds, which also likely contributes to its vitality and robust constitution. Recent trends to breed for a particular "type" color, coat, or size by means of line inbreeding have had a negative impact on genetic diversity and have resulted in numerous genetically recessive traits being expressed in the phenotype. Hypothyroidism, hip and elbow dysplasia have been encountered in a number of these line breed dogs, traits that under their traditional roles as livestock guardians, would have resulted in the dogs lacking capacity to survive in harsh environments, lacking the physical capabilities to perform the essential functions and critical demands of their vocation, and these dogs would have either been culled by the shepherds, of succumbed to he rigors of their environment or the predators confronted. Genetic studies have demonstrated the Kangal, Sage Koochee, Armenian Gampr, and Central Asian Ovtcharka dogs share a very close genetic composition, likley all arising from Central Asian dogs. This of course makes sense, as these dogs traveled along ancient caravan and silk routes and breeding along these lines with regional dogs would be anticipated. Lines would get typed and achieve a region phenotype as generations passed.