Is the pedigree important when buying a dog?

The pedigree certificate owned by a pedigree dog can be said to be the dog’s household registration book. It is a record of the health status, training results and other records of the dog and its ancestors for three generations. We can judge the pedigree of the dog based on the records of its ancestors and the basis for improvement in breeding. The improvement of dogs is determined by the combination of bloodlines and inbreeding. Dogs are usually divided into three types:
(1) The quality of the dogs is high, but the bloodlines are chaotic. Such dogs may perform well in competitions, but their bloodlines are unstable, so the quality of the puppies they breed is poor. They are also uneven.
(2) Their own conditions are average, but their bloodlines are clear. The quality of the puppies bred by such dogs is more average and stable.
(3) Their own quality is high, and their bloodlines are clear. This is how the pricey dog ​​was born.