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Unexpected changes in the appearance of animals, which include unusual dimension, 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 happens, people choose those who are their particular favorite”. The introduction of most feline breeds continues to be accelerating only in the past seventy five years, plus dog breeds have already been developing for centuries, as confirmed by Elaine Ostrander, chief researcher at the Department of Cancer Comparative and Genetics Genomics at the National Institute of Health ).