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