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Different dog breeds are associated with different ancestral lines. Some dog breeds are natural while selective dog breeding is also carried out for getting the excellent dog breeds. For thousands of years the dogs have been selectively breeding. Selecting dog breeding is done by two ways firstly, inbreeding the dogs from the same ancestral lines and secondly, inbreeding the dogs from different ancestral lines. In the same ancestral breeding, the same dog breeds mate to reproduce the offspring of the same line.