Natural Selection is nature's fail-safe method to maintain eugenics (good genes and fine offspring). All dogs are different; individual variation is an inherent characteristic of sexual reproduction. Different dogs fair differently in different situations: those dogs best suited to the immediate environment (the genetically fittest) do well; the less fit do less well; and the unfit usually die. In the wild, the process of natural selection promotes the survival of the fittest and the elimination of nature's mistakes.
Additionally, nature has a wonderful way to promote good breeding —...
https://www.dogstardaily.com/blogs/dr-ian-dunbar/eugenics-or-dysgenics
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