Dogs have been around humans for over 30,000 years and have earned themselves the title of humans’ best friends. Since being domesticated, the species has undergone dramatic changes due to selective breeding. People have bred dogs for their advantage, sometimes causing the animals severe health problems. However, only in the 20th century did the selective breeding of dogs become more sophisticated as new methods were discovered.

What Is Selective Breeding, and When Did It Start?

Selective breeding means selecting the species with desirable traits for breeding to increase those qualities in a population. This is usually done to benefit humans and might not always be favorable to the particular animal in its natural environment.

Some of the earliest examples of selective breeding can be f

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