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Unexpected modifications in our appearance of animals, including unusual size, scabies, poop tail or other characteristic features, are the result of genetic mutation that occur at all times naturally. Mutations that people like are then tried to maintain to the greatest extent possible. Lyons explains that each animal has a defined “basic plan of the body structure, and when the mutation occurs, people select those who are their particular favorite”. The introduction of most feline breeds continues to be accelerating only in the past 75 years, and dog breeds happen to be developing for hundreds of years, as confirmed by Elaine Ostrander, chief researcher at the Department of Cancer Genetics and Comparative Genomics at the National Institute of Health ).